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Siamese algae eater tank mates and minimum tank size

Crossocheilus oblongus

Siamese algae eaters grow to 16 cm (6.3 in). They need 24–26 °C (75–79 °F) and pH 6.5–8.0.

Minimum tank

208 L (55 US gal)

Adult size

16 cm (6.3 in)

Temperature

24–26 °C (75–79 °F)

pH

pH 6.5–8.0

Group

no minimum

Siamese algae eater minimum tank size

Siamese algae eaters need at least 208 L (55 US gal).

That is the largest minimum among the sources below. The planner also checks the tank length against the adult size of 16 cm (6.3 in): a tank shorter than 4 times that is cramped (64 cm (25 in)).

Siamese algae eater tank mates

Each of the other 52 species in this reference, judged against Siamese algae eaters by the same rules as the compatibility checker. A guide, not a guarantee.

Compatible (33)

• Black neon tetra
• Black skirt tetra
• Bristlenose pleco
• Bronze corydoras
• Celestial pearl danio
• Cherry barb
• Chili rasbora
• Clown loach
• Common pleco
• Congo tetra
• Dwarf gourami
• Ember tetra
• Endler's livebearer
• Glass catfish
• Glowlight tetra
• Guppy
• Harlequin rasbora
• Honey gourami
• Kribensis
• Lemon tetra
• Molly
• Mystery snail
• Neon tetra
• Nerite snail
• Otocinclus
• Panda corydoras
• Pearl gourami
• Platy
• Pygmy corydoras
• Serpae tetra
• Swordtail
• Tiger barb
• Yoyo loach

With care (6)

• AngelfishThe only temperature that suits both is 25.6–26 °C (78–79 °F), set by angelfish and Siamese algae eaters. That leaves no margin.
• BettaBettas are usually best kept alone. Some accept calm tank mates such as Siamese algae eaters, many do not.
• Cherry shrimpSiamese algae eaters leave adult cherry shrimp alone but may eat their young.
• DiscusThe only temperature that suits both is 26 °C (79 °F), set by discus and Siamese algae eaters. That leaves no margin.
• Kuhli loachThe only pH that suits both is pH 6.5, set by Siamese algae eaters and kuhli loaches. That leaves no margin.
• Zebra danioThe only temperature that suits both is 24 °C (75 °F), set by Siamese algae eaters and zebra danios. That leaves no margin.

Not compatible (13)

• Boeseman's rainbowfishBoeseman's rainbowfish need 27–30 °C (81–86 °F); Siamese algae eaters need 24–26 °C (75–79 °F). No temperature suits both.
• Cardinal tetraSiamese algae eaters need pH 6.5–8.0; cardinal tetras need pH 4.0–6.0. No pH suits both.
• Cockatoo dwarf cichlidSiamese algae eaters need pH 6.5–8.0; cockatoo dwarf cichlids need pH 6.0. No pH suits both.
• Convict cichlidConvict cichlids are aggressive and best kept in a tank of their own; they attack fish several times their size, so Siamese algae eaters would be harassed.
• German blue ramGerman blue rams need 27–30 °C (81–86 °F); Siamese algae eaters need 24–26 °C (75–79 °F). No temperature suits both. Siamese algae eaters need pH 6.5–8.0; German blue rams need pH 5.0–6.0. No pH suits both.
• GoldfishSiamese algae eaters need 24–26 °C (75–79 °F); goldfish need 15.6–21.1 °C (60–70 °F). No temperature suits both.
• OscarOscars grow to 46 cm and eat animals they can swallow; Siamese algae eaters grow to 16 cm.
• Paradise fishSiamese algae eaters need 24–26 °C (75–79 °F); paradise fish need 16–22 °C (61–72 °F). No temperature suits both.
• Peppered corydorasSiamese algae eaters need 24–26 °C (75–79 °F); peppered corydoras need 22–23 °C (72–73 °F). No temperature suits both.
• Red tail sharkRed tail sharks fight shark-shaped cyprinids, and Siamese algae eaters are one of them.
• Rosy barbSiamese algae eaters need 24–26 °C (75–79 °F); rosy barbs need 18–22 °C (64–72 °F). No temperature suits both.
• Rummy-nose tetraSiamese algae eaters need pH 6.5–8.0; rummy-nose tetras need pH 5.5–6.0. No pH suits both.
• White cloud mountain minnowSiamese algae eaters need 24–26 °C (75–79 °F); white cloud mountain minnows need 18–22 °C (64–72 °F). No temperature suits both.

Sources

Where sources differ, the value shown is computed as the most cautious one.

Behaviour notes are from Aquarium Co-op care guides, read 2026-10-26.

Check against another species Plan a tank