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Quick answers to the most common fish keeping questions — koi, goldfish, bettas, water chemistry, tank setup, and more.

Find out if your tank or pond is big enough for your fish — works for koi, goldfish, bettas, cichlids, and saltwater setups.

Enter your test kit readings and get an instant AI diagnosis — pH, ammonia, nitrite, nitrate, and more.

Calculate how many gallons your pond or tank holds by entering your dimensions.

Find out exactly how much to feed your fish based on their size, number, and the current season.

Ask our AI anything about fish keeping — any species, any question, instant friendly answers.

Find out if your koi, goldfish, or other fish can safely overwinter outdoors based on your USDA hardiness zone and pond depth.

Find out if your fish species are compatible before you buy — instant AI analysis of temperament, aggression, and water parameter conflicts.

Find the real upfront and ongoing cost of keeping koi, goldfish, tropical fish, or a saltwater tank — including equipment, food, and electricity.

Upload a photo of your fish and get an instant AI assessment of visible symptoms — spots, fin damage, discoloration, and more.

Everything a first-time koi keeper needs to know — pond size, filtration, the nitrogen cycle, and what to expect in year one.

Plain-English guide to pH, ammonia, nitrite, nitrate, KH and GH — what they mean and what to do when readings are off.

How to care for your koi through spring, summer, autumn, and winter — including when to stop feeding.

How to identify and treat fin rot, ich, anchor worm, ulcers, dropsy, flukes, and swim bladder issues.

What to feed, how much, how often, and how feeding changes with the seasons. Plus foods to never give your fish.

Gravity filters, bead filters, UV sterilizers, and bottom drains — what they do and which is right for your pond.

From Kohaku to Butterfly koi — a guide to the most popular varieties and what makes each one special.

The best aquatic plants for koi ponds — which ones absorb nitrates, provide shade, and survive koi nibbling.

Tank sizing, water quality, feeding, health issues, and the difference between fancy and single-tailed goldfish.

Tank size, temperature, gentle filtration, feeding, and common health problems for betta fish.

Getting started with a marine tank — salinity, equipment, cycling, water parameters, and choosing your first marine fish.

African, South American, and Central American cichlids — tank size, water chemistry, aggression management.

The honest answer to one of the most Googled koi questions — with the math and stocking rules explained.

Causes, dangers, and step-by-step treatment for a koi pond ammonia spike.

What to feed koi in spring, summer, autumn and winter with seasonal product recommendations.

Why the bowl myth is harmful and what size tank bettas actually need to thrive.

White cloudiness, green water, and brown tint all have different causes — find yours here.

What to look for in a 55 gallon aquarium filter and which types work best for different fish.

How to set up an African cichlid tank — tank size, water chemistry, rockwork, stocking, filtration, and managing aggression in Malawi and Tanganyika cichlid tanks.

A complete beginner's guide to cycling a fish tank — what the nitrogen cycle is, how long it takes, and exactly how to do it safely before adding fish.

Which fish can safely live with bettas and which will cause problems. A complete betta tank mate guide with safe options and fish to always avoid.

The real answer depends on your setup — stocking, filtration, and feeding all play a part. Here's how to figure out yours.

Nitrite is the second stage of the nitrogen cycle and just as dangerous as ammonia. Here's how to recognize it and treat it fast.