Demasoni tank mates

Demasoni: aggressive, 3 in, kept in groups of 6 or more, swims in the bottom and middle of the tank and needs about 64 gallons. The list below checks every species in our catalog against it.

Each species is checked against demasoni both ways: mouth size, fin nipping, temperament, territory, water overlap and keeper reports.

Good tank mates

Betta
Betta splendens
Fits
The Siamese fighting fish: one male per tank, warm still water, and no long-finned or nippy tank mates.
2.8 in · 11+ gal · 72–86°F · pH 6–7.5
Angelfish
Pterophyllum scalare
Fits
Tall, graceful cichlids for tall tanks of 30 gallons and up; adults eat neon tetras and shrimp, so stock around them.
3.5 in · 32+ gal · 77–84°F · pH 6–7
Common pleco
Pterygoplichthys pardalis
Fits
The classic store 'algae eater' that grows to nearly two feet, fouls the water and eats less algae with age; a fish for very large tanks only.
22.8 in · 203+ gal · 77–82°F · pH 7–7.5
Dwarf gourami
Trichogaster lalius
Fits
A bright little gourami popular with beginners; one male per tank, no bettas, and buy carefully, as imported fish often carry an incurable iridovirus.
3 in · 18+ gal · 72–81°F · pH 6–7.5
Kuhli loach
Pangio semicincta
Fits
A banded, eel-like loach of about 4 inches that burrows by day and explores the bottom as a group in the evening; needs soft sand.
3.9 in · 17+ gal · 70–79°F · pH 3.5–7
Leopard sailfin pleco
Pterygoplichthys gibbiceps
Fits
A tall-finned pleco with a brocade pattern that is sold at 2 inches and grows to about 20, needing a very large tank and heavy filtration.
19.7 in · 187+ gal · 77–86°F · pH 5–7
Pearl gourami
Trichopodus leerii
Fits
One of the calmest and most beautiful gouramis, covered in pearly spots; ideal for a quiet planted tank with floating plants.
4.7 in · 26+ gal · 75–86°F · pH 5.5–8
Assassin snail
Anentome helena
Fits
A yellow-and-brown striped predatory snail kept to control bladder, ramshorn and trumpet snails; it breeds slowly and never becomes a pest.
1 in · 3+ gal · 70–81°F · pH 7.2–8
Red swamp crayfish
Procambarus clarkii
Fits
A hardy but aggressive American crayfish that digs burrows, wrecks plants and eats snails and fish; invasive in many countries and banned in the EU.
3.9 in · 25+ gal · 68–79°F · pH 7–8.5
Figure eight puffer
Dichotomyctere ocellatus
Fits
A small puffer with a figure-eight pattern for fresh or slightly brackish water; it loves snails and nips slow tank mates.
3.1 in · 22+ gal · 72–79°F · pH 6.5–7.5
Kissing gourami
Helostoma temminckii
Fits
The famous kissing fish grows to about 10 inches and can live over 20 years; its kisses are really contests for dominance.
9.8 in · 95+ gal · 72–86°F · pH 6–8
Paradise fish
Macropodus opercularis
Fits
One of Europe's first aquarium fish: a hardy, striped labyrinth fish that lives without a heater, but males are pugnacious.
3.1 in · 23+ gal · 61–72°F · pH 6–8

Risky

And 89 more in the species catalog.

Avoid

And 24 more in the species catalog.

Every tank is different. Set yours up once (size, water, who already lives there) and each species is checked against it.

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