https://fishtankhelper.com/ Free fish tank calculators and plain-English aquarium guides by Andy, who keeps 18 tanks. en-us https://fishtankhelper.com/guides/how-to-clean-a-fish-tank.html https://fishtankhelper.com/guides/how-to-clean-a-fish-tank.html Mon, 02 Nov 2026 12:00:00 +0000 How to clean a fish tank step by step without removing the fish: gravel, sand, glass and decorations, how often to clean, and the mistakes that kill fish. https://fishtankhelper.com/guides/how-to-breed-jewel-cichlids.html https://fishtankhelper.com/guides/how-to-breed-jewel-cichlids.html Mon, 02 Nov 2026 12:00:00 +0000 How to breed Lake Turkana jewel cichlids: water, getting a pair, triggering a spawn, eggs to free-swimming fry, first foods and when to move the fry. https://fishtankhelper.com/guides/fish-swimming-sideways.html https://fishtankhelper.com/guides/fish-swimming-sideways.html Mon, 02 Nov 2026 12:00:00 +0000 Fish swimming sideways, upside down or lying on the bottom? It's usually a swim bladder problem. What causes it, what to do right now, and how to stop it. https://fishtankhelper.com/guides/fish-not-eating.html https://fishtankhelper.com/guides/fish-not-eating.html Mon, 02 Nov 2026 12:00:00 +0000 Why is my fish not eating? 8 common reasons, from new fish stress and bad water to picky bettas and illness, plus how long fish can go without food. https://fishtankhelper.com/guides/cloudy-aquarium-water.html https://fishtankhelper.com/guides/cloudy-aquarium-water.html Mon, 02 Nov 2026 12:00:00 +0000 Why is my fish tank cloudy? How to tell white, green and brown cloudy water apart, what causes each one, and how to clear it safely. https://fishtankhelper.com/guides/betta-fish-tank-setup.html https://fishtankhelper.com/guides/betta-fish-tank-setup.html Mon, 02 Nov 2026 12:00:00 +0000 Betta fish care for beginners: the right tank size, heater, filter and water temperature, how much to feed, tankmates, weekly care and common betta problems. https://fishtankhelper.com/guides/best-algae-eaters.html https://fishtankhelper.com/guides/best-algae-eaters.html Mon, 02 Nov 2026 12:00:00 +0000 The best algae eaters for fish tanks: nerite snails, Amano shrimp, otocinclus and bristlenose plecos, by tank size, for betta tanks, and which ones to avoid. https://fishtankhelper.com/guides/75-gallon-fish-tank-stocking-ideas.html https://fishtankhelper.com/guides/75-gallon-fish-tank-stocking-ideas.html Mon, 02 Nov 2026 12:00:00 +0000 Six 75 gallon fish tank stocking ideas, from an angelfish group to fancy goldfish. Plus 75 gallon tank dimensions, weight, heater and filter size. https://fishtankhelper.com/guides/55-gallon-fish-tank-stocking-ideas.html https://fishtankhelper.com/guides/55-gallon-fish-tank-stocking-ideas.html Mon, 02 Nov 2026 12:00:00 +0000 Six 55 gallon fish tank stocking ideas, from angelfish to a big tetra school, checked with a stocking calculator. Plus 55 gallon dimensions and weight. https://fishtankhelper.com/guides/29-gallon-fish-tank-stocking-ideas.html https://fishtankhelper.com/guides/29-gallon-fish-tank-stocking-ideas.html Mon, 02 Nov 2026 12:00:00 +0000 How many fish in a 29 gallon tank? About 12 to 17 small fish. Six setups that work, plus 29 gallon tank dimensions, weight, heater size and fish to avoid. https://fishtankhelper.com/guides/20-gallon-fish-tank-stocking-ideas.html https://fishtankhelper.com/guides/20-gallon-fish-tank-stocking-ideas.html Mon, 02 Nov 2026 12:00:00 +0000 How many fish in a 20 gallon tank? About 10 to 15 small fish. Six community setups checked with a stocking calculator, plus 20 high vs 20 long. https://fishtankhelper.com/guides/10-gallon-fish-tank-stocking-ideas.html https://fishtankhelper.com/guides/10-gallon-fish-tank-stocking-ideas.html Mon, 02 Nov 2026 12:00:00 +0000 How many fish in a 10 gallon tank? About 6 to 14 small fish. Six setups that work, from a betta with ember tetras to a shrimp colony, plus fish to avoid. https://fishtankhelper.com/tools/water-test-results.html https://fishtankhelper.com/tools/water-test-results.html Sat, 31 Oct 2026 12:00:00 +0000 Type in your ammonia, nitrite, nitrate and pH test results to see what each number means, how toxic your ammonia is, and how much water to change today. https://fishtankhelper.com/guides/gifts-for-fish-lovers.html https://fishtankhelper.com/guides/gifts-for-fish-lovers.html Sat, 31 Oct 2026 12:00:00 +0000 Gift ideas for fish lovers and aquarium keepers: stocking stuffers, useful upgrades, big gifts and what not to buy, from a keeper with 18 tanks. https://fishtankhelper.com/tools/fish-symptom-checker.html https://fishtankhelper.com/tools/fish-symptom-checker.html Sat, 31 Oct 2026 12:00:00 +0000 Free fish symptom checker. Tick what you see (white spots, ragged fins, gasping, pinecone scales) and see which of 14 common problems fit best, how urgent each is and what to do. https://fishtankhelper.com/tools/aquarium-dosing-calculator.html https://fishtankhelper.com/tools/aquarium-dosing-calculator.html Sat, 31 Oct 2026 12:00:00 +0000 Free aquarium dosing calculator. How much Prime, Stress Coat, Ich-X, KanaPlex, PraziPro, aquarium salt, Stability or Flourish for your tank, in ml, teaspoons or drops. https://fishtankhelper.com/guides/shell-dweller-care.html https://fishtankhelper.com/guides/shell-dweller-care.html Fri, 30 Oct 2026 12:00:00 +0000 How to keep shell dwellers like multies: tank size, sand and shells, hard water, feeding, colony behavior, breeding and tankmates. https://fishtankhelper.com/guides/normans-lampeye-killifish-care.html https://fishtankhelper.com/guides/normans-lampeye-killifish-care.html Fri, 30 Oct 2026 12:00:00 +0000 How to keep Norman's lampeye killifish: tank size, temperature, feeding, tankmates, males vs females, and how to breed them and raise the fry. https://fishtankhelper.com/guides/how-to-do-a-water-change.html https://fishtankhelper.com/guides/how-to-do-a-water-change.html Fri, 30 Oct 2026 12:00:00 +0000 How to change aquarium water safely: about 25% once a week for most tanks, a step-by-step gravel vacuum routine, and the mistakes that stress fish. https://fishtankhelper.com/guides/how-to-clean-an-aquarium-filter.html https://fishtankhelper.com/guides/how-to-clean-an-aquarium-filter.html Fri, 30 Oct 2026 12:00:00 +0000 Clean your filter when the flow slows: every 2–4 weeks for hang-on-back filters, 1–3 months for canisters. Step by step, without losing the good bacteria. https://fishtankhelper.com/guides/how-to-breed-mystery-snails.html https://fishtankhelper.com/guides/how-to-breed-mystery-snails.html Fri, 30 Oct 2026 12:00:00 +0000 How mystery snails breed, what to do with the egg clutch above the waterline, how to raise the babies, and how to stop them breeding. https://fishtankhelper.com/guides/how-to-breed-guppies.html https://fishtankhelper.com/guides/how-to-breed-guppies.html Fri, 30 Oct 2026 12:00:00 +0000 How to breed guppies: 1 male to 2 or 3 females, signs of a pregnant guppy, the 21 to 30 day pregnancy, saving and feeding the fry, and breeding for color. https://fishtankhelper.com/guides/celestial-pearl-danio-care.html https://fishtankhelper.com/guides/celestial-pearl-danio-care.html Fri, 30 Oct 2026 12:00:00 +0000 Celestial pearl danio (galaxy rasbora) care: a planted 10 to 20 gallon tank, 72–76°F, groups of 6 or more, feeding tiny mouths, tankmates and breeding. https://fishtankhelper.com/guides/bristlenose-pleco-care.html https://fishtankhelper.com/guides/bristlenose-pleco-care.html Fri, 30 Oct 2026 12:00:00 +0000 Bristlenose pleco care: a 20+ gallon tank at 72–80°F, why they need wood, what to feed besides algae, tankmates, babies, and how they differ from common plecos. https://fishtankhelper.com/guides/best-fish-food-for-beginners.html https://fishtankhelper.com/guides/best-fish-food-for-beginners.html Fri, 30 Oct 2026 12:00:00 +0000 Top pick: Fluval Bug Bites for most community fish. Plus the best food for bottom feeders, tiny fish and bettas, how much to feed, and feeding for fast growth. https://fishtankhelper.com/guides/best-canister-filter.html https://fishtankhelper.com/guides/best-canister-filter.html Fri, 30 Oct 2026 12:00:00 +0000 Which canister filter for a 29, 40, 55 or 75 gallon tank, in one table: the Fluval 107 to 407 and EHEIM Classic. Plus a no-leak setup checklist. https://fishtankhelper.com/guides/best-aquarium-filter.html https://fishtankhelper.com/guides/best-aquarium-filter.html Fri, 30 Oct 2026 12:00:00 +0000 Top pick: the Fluval AquaClear. Quiet, easy to clean and sized for 5 to 110 gallons. Plus the best sponge filter for bettas and shrimp, and when to go canister. https://fishtankhelper.com/guides/aquarium-temperature.html https://fishtankhelper.com/guides/aquarium-temperature.html Fri, 30 Oct 2026 12:00:00 +0000 Most tropical fish do best at 76–78°F (24–26°C). Find your fish in the chart of 24 common species, then fix a tank that runs too hot or too cold. https://fishtankhelper.com/guides/aquarium-co2-and-fertilizer.html https://fishtankhelper.com/guides/aquarium-co2-and-fertilizer.html Fri, 30 Oct 2026 12:00:00 +0000 Do aquarium plants need CO2? Low tech vs high tech tanks, liquid fertilizer vs root tabs, signs of hungry plants, and when CO2 is worth it. https://fishtankhelper.com/guides/angelfish-care.html https://fishtankhelper.com/guides/angelfish-care.html Fri, 30 Oct 2026 12:00:00 +0000 How to care for freshwater angelfish: a tall 30+ gallon tank (55 for a pair), 76–84°F, feeding, how many to keep, safe tankmates and three example tanks. https://fishtankhelper.com/guides/5-gallon-fish-tank-ideas.html https://fishtankhelper.com/guides/5-gallon-fish-tank-ideas.html Fri, 30 Oct 2026 12:00:00 +0000 What can live in a 5 gallon tank? A betta, 5 male Endlers or a cherry shrimp colony. Five setups checked with a stocking calculator, plus fish to avoid. https://fishtankhelper.com/guides/40-gallon-breeder-stocking-ideas.html https://fishtankhelper.com/guides/40-gallon-breeder-stocking-ideas.html Fri, 30 Oct 2026 12:00:00 +0000 Six 40 gallon breeder stocking ideas, from a peaceful community to fancy goldfish. Plus 40 breeder dimensions, weight, heater and filter size. https://fishtankhelper.com/guides/why-are-my-fish-dying.html https://fishtankhelper.com/guides/why-are-my-fish-dying.html Mon, 26 Oct 2026 12:00:00 +0000 Fish dying in your aquarium? What to do right now, the nine most common causes, from an uncycled tank to bad tankmates, and how to read the clues. https://fishtankhelper.com/guides/what-you-need-to-start-a-fish-tank.html https://fishtankhelper.com/guides/what-you-need-to-start-a-fish-tank.html Mon, 26 Oct 2026 12:00:00 +0000 A complete beginner checklist for starting a fish tank: the must-haves, the nice-to-haves, and what to skip, plus how much it costs. https://fishtankhelper.com/tools/water-change-calculator.html https://fishtankhelper.com/tools/water-change-calculator.html Mon, 26 Oct 2026 12:00:00 +0000 Free aquarium water change calculator. Find out what percentage of water to change to bring nitrate down, and how much to change each week to keep it there. https://fishtankhelper.com/guides/swordtail-fish-care.html https://fishtankhelper.com/guides/swordtail-fish-care.html Mon, 26 Oct 2026 12:00:00 +0000 How to keep swordtail fish: tank size, hard water, males vs females, babies, feeding, tankmates and three swordtail tanks checked with a free stocking calculator. https://fishtankhelper.com/guides/quarantine-tank-setup.html https://fishtankhelper.com/guides/quarantine-tank-setup.html Mon, 26 Oct 2026 12:00:00 +0000 Why to quarantine new fish, what you need for a simple quarantine tank, how to keep it cycled, and how long to quarantine before adding fish to your main tank. https://fishtankhelper.com/guides/platy-fish-care.html https://fishtankhelper.com/guides/platy-fish-care.html Mon, 26 Oct 2026 12:00:00 +0000 How to keep platy fish: tank size, temperature, males vs females, breeding, feeding, tankmates and three platy tanks checked with a free stocking calculator. https://fishtankhelper.com/guides/nitrite-in-fish-tank.html https://fishtankhelper.com/guides/nitrite-in-fish-tank.html Mon, 26 Oct 2026 12:00:00 +0000 What nitrite in your aquarium means, safe nitrite levels, the signs of nitrite poisoning, why it spikes, and how to bring it to zero fast. https://fishtankhelper.com/guides/neon-tetra-care.html https://fishtankhelper.com/guides/neon-tetra-care.html Mon, 26 Oct 2026 12:00:00 +0000 How to keep neon tetras: tank size, temperature, group size, feeding, tankmates, neon vs cardinal tetras, and three example tanks. https://fishtankhelper.com/guides/molly-fish-care.html https://fishtankhelper.com/guides/molly-fish-care.html Mon, 26 Oct 2026 12:00:00 +0000 How to keep molly fish: tank size, hard water, whether they need salt, males vs females, babies, feeding, tankmates and example tanks. https://fishtankhelper.com/guides/l239-blue-panaque-care.html https://fishtankhelper.com/guides/l239-blue-panaque-care.html Mon, 26 Oct 2026 12:00:00 +0000 How to keep an L239 blue panaque pleco (Baryancistrus beggini): adult size, tank, warm water, what to feed, tankmates, and how it differs from a bristlenose. https://fishtankhelper.com/guides/ich-white-spots-on-fish.html https://fishtankhelper.com/guides/ich-white-spots-on-fish.html Mon, 26 Oct 2026 12:00:00 +0000 White spots like grains of salt on your fish? How to tell if it's ich, why treatment takes a while, and a step-by-step plan to get rid of it for good. https://fishtankhelper.com/guides/how-to-set-up-a-fish-tank.html https://fishtankhelper.com/guides/how-to-set-up-a-fish-tank.html Mon, 26 Oct 2026 12:00:00 +0000 How to set up a fish tank from start to finish: where to put it, rinsing, substrate, filling, plants, filter, heater and light, cycling, and adding your first fish. https://fishtankhelper.com/guides/how-to-cycle-a-fish-tank.html https://fishtankhelper.com/guides/how-to-cycle-a-fish-tank.html Mon, 26 Oct 2026 12:00:00 +0000 Cycling grows the good bacteria that keep fish alive. Here's how to cycle a new aquarium step by step, how long it takes, and how to tell when it's done. https://fishtankhelper.com/guides/how-to-breed-swordtails.html https://fishtankhelper.com/guides/how-to-breed-swordtails.html Mon, 26 Oct 2026 12:00:00 +0000 How to breed swordtail fish: telling males from females, signs of a pregnant swordtail, saving and feeding the fry, and crossing with platies. https://fishtankhelper.com/guides/how-to-breed-corydoras.html https://fishtankhelper.com/guides/how-to-breed-corydoras.html Mon, 26 Oct 2026 12:00:00 +0000 How to breed corydoras catfish: males vs females, what triggers spawning, saving the sticky eggs, stopping fungus, and feeding the fry. https://fishtankhelper.com/guides/how-to-breed-cherry-shrimp.html https://fishtankhelper.com/guides/how-to-breed-cherry-shrimp.html Mon, 26 Oct 2026 12:00:00 +0000 How to breed cherry shrimp: males vs females, berried shrimp, a tank where babies survive, feeding, water changes and keeping strong colors. https://fishtankhelper.com/guides/how-to-breed-bristlenose-plecos.html https://fishtankhelper.com/guides/how-to-breed-bristlenose-plecos.html Mon, 26 Oct 2026 12:00:00 +0000 How to breed bristlenose plecos: telling males from females, the right cave, what triggers spawning, eggs and fry, and feeding the babies. https://fishtankhelper.com/guides/how-to-acclimate-fish.html https://fishtankhelper.com/guides/how-to-acclimate-fish.html Mon, 26 Oct 2026 12:00:00 +0000 How to acclimate new fish and shrimp: the float method, drip acclimation, what to do after, and why bag water never goes in your tank.