Friendly guides for koi, goldfish, bettas, cichlids, saltwater fish, and more
Our most comprehensive guides covering every aspect of koi and pond care.
Everything a first-time koi keeper needs to know — pond size, filtration, the nitrogen cycle, choosing fish, and what to expect in year one.
A plain-English guide to pH, ammonia, nitrite, nitrate, KH and GH — what they mean, why they matter, 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 and how to winterize safely.
How to identify and treat fin rot, ich, anchor worm, ulcers, dropsy, flukes, and swim bladder issues before they become serious.
What to feed, how much, how often, and how feeding changes with the seasons. Plus the foods you should never give your fish.
Gravity filters, bead filters, moving bed reactors, UV sterilizers, and bottom drains — what they do and which is right for your pond.
From Kohaku to Showa, Tancho to Butterfly koi — a friendly introduction 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 actually survive being nibbled by curious koi.
Care guides for every type of fish keeper — all free, all in plain English.
Tank sizing, water quality, feeding, health issues, and the difference between fancy and single-tailed varieties.
Everything you need to keep your betta happy and healthy — tank size, temperature, gentle filtration, feeding, and common health problems.
Getting started with a marine tank — equipment, salinity, cycling, water parameters, and choosing your first marine fish.
African, South American, and Central American cichlids — what makes each group unique and how to keep them successfully.
How to set up a peaceful, thriving tropical aquarium — compatible fish, water parameters, feeding, and health care for beginners.
How to set up a thriving planted freshwater aquarium — lighting, substrate, CO2, best beginner plants, and compatible fish.
Everything our guides recommend — linked directly to Amazon for easy ordering.
Tests pH, ammonia, nitrite & nitrate
View on Amazon →Best water conditioner for all tanks
View on Amazon →Perfect cool weather koi food
View on Amazon →Quality everyday koi food
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Our free AI tools give instant, specific advice tailored to your exact setup — for any fish type.