Helpful guides for every stage of your fish keeping journey — beginner to expert
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 problems.
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.
Our free AI tools give you instant, specific advice tailored to your exact setup.