Max Size: 16cm

Siamese Algae Eater (Crossocheilus oblongus)

The Siamese Algae Eater is an excellent fish for the community aquarium. These fish are active and social creatures that will do well in both large groups, and when kept alone. Since they are peaceful, these fish are ideal for the beginner's community aquarium.

The Siamese Algae Eaters prefer a planted aquarium with many broad-leaved plants on which it can rest. It also needs these plants and rocks for grazing algae. You can keep this species with a variety of tank mates including more passive community fish.

True Siamese Algae Eaters have an elongated slim body that is usually pale grey or gold and displays a thick black stripe that traverses from the nose to the tail. You may find that that stripe will sometimes begin to fade this is usually during a mating display, in times of stress, or a way to camouflage themselves. They also have a clear caudal fin with a moustache that some call Rostral barbels.


Siamese Algae Eater
Siamese Algae Eater
Siamese Algae Eater
Siamese Algae Eater
Siamese Algae Eater
Quick Facts
Scientific NameCrossocheilus oblongus
Other NamesNone
OriginsMalaysia, Thailand
Aquarium LevelBottom
DifficultyBeginner - Intermediate
Lifespanup to 10 years
Water Parameters
Water TypeFreshwater
PH6.5 - 8.0
GH5 - 20
KH5 - 10
75 - 79℉
23.9 - 26.1℃


In the home aquarium, the Siamese Algae Eater will readily accept most good quality dried foods such as granules, flakes and sinking pellets. These modern food products have been developed to provide all adequate nutrition to maintain your fish's health and dietary requirements.

Providing additional foodstuffs such as live, frozen, and freeze-dried meals such as bloodworm, daphnia, and tubifex once or twice a week will provide additional benefits to your fish's health and well-being but is not a must for this fish.

It should be noted that bloodworms should only be given as an occasional treat and should not be used as the staple diet as they are difficult for fish to digest and can potentially cause blockages.

This fish is an omnivore in the wild, meaning it will consume some vegetable matter. Although most modern fish foods take this into account and include them in their products, you can still supplement your fish's diet with blanched vegetables such as spinach, broccoli, and zucchini. Ensure you do not overfeed your fish and remove any leftovers the following day.

Tank Mates

1 interesting tank mate ideas for the Siamese Algae Eater could include:

Banded Gourami(Trichogaster fasciata)

Sexual Dimorphism

It is very tricky to differentiate males from females the only known differences are females tend to be relatively more extensive than the males, and the males are slightly slimmer

Other Sharks of interest

Bala Shark(Balantiocheilos Melanopterus)
Black Sharkminnow(Labeo chrysophekadion)
Chinese High Fin Banded Shark(Myxocyprinus Asiaticus)
Chinese Neon Golden Stripe Shark(Sarcocheilichthys parvus)
Rainbow Shark(Epalzeorhynchos Frenatum)
Red Tailed Black Shark(Epalzeorhynchos bicolor)
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Date Added: 08/10/2020 - Updated: 19/01/2022 14:09:31