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Fish

Freshwater favourites from the single betta to community tetras and pond koi — with honest tank sizes, because most fish problems start with a tank that's too small.

Angelfish

6 inches long; 8–10 inches tall including fins

Betta

2.25–3 inches

Boeseman's Rainbowfish

4–4.5 inches (males); females slightly smaller

Bristlenose Pleco

4–5 inches

Cherry Barb

2 inches

Clown Loach

9–12 inches as adults — shops sell them at 1.5–2 inches

Corydoras Catfish

1–3 inches depending on species (most 2–2.5 inches)

Discus

6–8 inches in diameter

Dwarf Gourami

2–3 inches (males the larger)

Goldfish

Common goldfish 10–12+ inches; fancy varieties 6–8 inches

Guppy

1–2.5 inches (females larger)

Harlequin Rasbora

1.75–2 inches

Koi

24–36 inches typical; large fish exceed 3 feet

Molly

3–4.5 inches (sailfin males to 5 inches with finnage)

Neon Tetra

1–1.5 inches

Otocinclus

1–1.5 inches

Pearl Gourami

4–5 inches

Platy

2–2.5 inches

Swordtail

4–5.5 inches including the male's sword; body about 4 inches

Zebra Danio

2 inches