Beginner Guides

The essentials, in the order a new fishkeeper needs them.

The fishless cycle, step by step: ammonia dosing, testing, the 24-hour readiness check, and honest answers about shortcuts.

Five ways the hobby's most famous rule fails — and the five-factor method that replaces it.

Eight hardy species that forgive mistakes, with full care numbers — plus the popular fish to avoid for now.

Anywhere from 1 to 30 — depending on the fish. Real combinations with real stocking levels, and the three questions that decide your number.

Not a bowl — ever. Fancy vs common goldfish, real adult sizes and lifespans, and why goldfish stop growing in small tanks (it's not a good thing).

The combinations that commonly work, the ones that never do, minimum tank sizes, and the temperament caveat nobody can skip.

The seven causes, in order — starting with a five-minute water test. Almost never bad luck; almost always fixable.

White, green or brown — the colour is the diagnosis. What to do for each, and the common fixes that make it worse.