Siamese algae eaters (Crossocheilus oblongus) are a popular species of freshwater fish kept in aquariums for their algae-eating abilities. They are known for their effectiveness in helping to control algae growth in tanks.
| Demographics | |
| Scientific Name | Crossocheilus oblongus |
| Origins | Southeast Asia, Thailand and Malaysia |
| Adult Size | 6″ |
| Lifespan | Up to 10 Years |
| Temperment | Peaceful |
| Diet | Omnivore |
| Breeding | Egglayer |
| Min School Size | 1 |
| IUCN Status | LC |
| Tank Setup Parameters | |
| Temperature | 75°F to 80°F |
| pH | 6.5 – 7.8 |
| Water Hardness | Soft to Medium |
| Tank Zone | All Zones |
| Substrate | Sand / Fine Gravel |
| Heating Required | Yes |
| Lighting Requirement | Medium |
| Plant Friendly | Yes |
| Min Tank Size | 20 gallons |
Behavior
While Siamese algae eaters can be kept individually, they are social fish and may do better in a group of 3-5. They tend to feel more secure when in groups. They swim all over the tank, but often scavage for food on the substrate surface. They are mostly peaceful with other community fish, but could show mild territorial behaviour if hiding spots and food is scarce. Siamese Algae Eaters are not known to be fin-nippers, so they are safe for long fin species.
Tank Setup
At least 30 gallons is best if you have more than one SAE, as they do benefit from lots of space to move around in. Moderate water flow is ideal, but they will tollerate slower or faster currents. Good filtration is a must for these species to keep the water quality high. Siamese Algae eaters appreciate plenty of plants in their environment, they help with hiding places and provide a good source to graze for algae. Plants such as Annubias, Java Fern, and Hornwort are good choices. A good soft substrate like fine gravel or sand is ideal as they do scavenge the bottom of the tank frequently. Moderate lighting is best for Siamese Algae Eaters.
Diet & Feeding
Siamese Algae Eaters are constant foragers. They will graze on plants, rocks, glass and even the filter intake if there is algae around. Algae is their primary source of food, but they are known to nibble on leftover food. They will gladly accept flakes, pellets, live or frozen food such as brine or bloodworms as a treat.
Breeding
Breeding Siamese Algae Eaters in a home aquarium is very rare as they require very specific water conditions and behaviours to breed. Most individuals kept in aquariums are non-breeding, and the species is usually propagated through commercial breeding rather than in-home aquariums.
Tank Mates
They generally get along with other non-aggressive fish, including small tetras, rasboras, guppies, danios, and corydoras. However, like any fish, it’s always best to ensure the tankmates are similarly sized or non-aggressive to avoid stress or potential conflicts.