Know what a species actually needs before you buy it

Surface area, a secure lid and calm water matter more than a tank-size number for this air-breathing surface predator.

Why "it can survive a bowl" and "it does well in a bowl" are different claims, backed by peer-reviewed welfare research.

How to tell it apart from a much larger species sold under the same loose "pleco" label.

It isn't a rasbora, and it's probably kept too warm and in too small a group — what the evidence actually supports.

A documented adult behaviour change most in-store labels never mention, and calmer alternatives worth considering instead.

One of the few "small tank" fish where that claim is actually true — and what it needs instead of swimming room.

One genus, 150+ species, and a substrate mistake that causes lasting, largely preventable damage.

Why discus are a common tankmate mismatch, and the unique way parents feed fry with skin mucus.

Sold as a peaceful community fish, but a grown angelfish is a cichlid that can prey on small tankmates — what to plan around instead.

Two colour forms, the same species, and one very different, deliberately bred body shape worth knowing about first.

Realistic adult size, a heavy bioload, and why fancy varieties carry a genuine swim bladder risk the common goldfish doesn't.

Strong current, high oxygen and cool water matter more here than a generic "algae eater" label.

A shy, nocturnal burrower usually sold under the wrong species name — and why that doesn't change how to keep it.

Hard, alkaline water, a strict plant-based diet, and a crowded species tank — not a small group.

How big it actually grows, and why a single fish or a group of five or more both work but two or three doesn't.

A cave-loving pairing fish often sold under a misleading name — and why cherry shrimp are a poor match for it.

A longer tank, a proper school and real patience — full adult colour genuinely takes many months to develop.

A trade name covering more than one species, and why algae alone isn't enough to feed it on.

The stripe test that tells a genuine Siamese algae eater apart from the several look-alikes sold under its name.

The one difference that actually holds up despite crossbreeding, plus the stocking ratio that protects your females.

Sold under several colour names, but every one is the same species — and males don't share a tank well.

A demanding, large-growing species: realistic tank size, disease risk, and the 2025 shift toward a genuine captive-bred alternative to wild-caught stock.

Captive-bred vs wild-caught, why clownfish don't need an anemone, and getting group size right.

Why their brackish-water larval stage means a tank full of shrimp isn't a risk you need to plan around.

Same species, different colours — and why mixing them undoes generations of selective breeding.

A filter feeder, not a grazer — why strong current matters more than the food you buy for it.

Eggs, the saddle and normal moulting versus Scutariella, Vorticella and other organisms — and what a photo genuinely can't confirm.

Why its exact identification is unresolved, what's genuinely known about its needs, and how to read its behaviour.

Why a secure lid matters as much as water chemistry, and what its egg clutch means for curious pets or children.

Why its larvae can't survive in freshwater, and what those white egg dots on the glass actually are.

The same rhizome rule as Java fern, the varieties worth knowing apart, and why goldfish and cichlids mostly leave it alone.

Attaching it correctly, the varieties worth knowing apart, and the black algae that targets its slow-growing leaves.

Sold as if they're interchangeable "clean-up crew" — they aren't. Which one actually suits your tank.

Six genuinely easy plants compared, and the one mistake that kills two of them more than any other.

Which species are genuinely easy, which need one thing planned for, and which are marketed as beginner-friendly but need more stability first.

Why a "peaceful community fish" label isn't enough, and the documented mismatches worth knowing before you stock.

A Chinese algae eater can turn on its tankmates as it grows — six options, compared honestly by what your tank actually provides.

Shops mix them up more often than you'd think — and only one of them keeps eating algae once it's grown.

Similarly sized, but one wants cooler, faster water and the other tolerates a standard tropical community tank.