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What fish can live with goldfish in a tank? I get asked this more than almost anything else,…

If you’ve ever stared at a pressurized CO2 setup and thought “there’s no way I’m plumbing that into…

The invasion always starts right when your tank stabilizes. For me, it began as a slight, fuzzy texture…

Can Goldfish Live With Betta Fish? No — goldfish and betta fish shouldn’t share a tank. One needs…

Do Goldfish Need a Filter? I learned the answer the hard way with my first carnival fish, “Bubbles.”…

Quick answer: A single goldfish needs a minimum 20-gallon fish tank for goldfish, and that’s really just the…

A goldfish staying in corner of tank isn’t sulking. It’s telling you something specific about its water, its…

Duckweed nitrate removal gets recommended in nearly every high-nitrate thread, almost always with zero numbers attached. How much…

You bought a UV sterilizer because someone said it would help with algae, or Ich, or both. You…

You measured your tank, did the math — 1 inch of fish per gallon, simple enough — and…