Can Otocinclus Catfish Live With Harlequin Rasbora?
Otocinclus Catfish and Harlequin Rasbora are compatible. Temperature overlap 73–79°F. Both peaceful.
Conditions: Minimum 20 gallon tank.
Parameter Comparison
| Parameter | Otocinclus Catfish | Harlequin Rasbora | Overlap |
|---|---|---|---|
| Temperature | 72–79°F | 73–82°F | 73–79°F ✓ |
| pH Range | 6–7.5 | 6–7.5 | 6–7.5 ✓ |
| Temperament | peaceful | peaceful | Both peaceful ✓ |
| Max Size | 2" | 2" | Similar ✓ |
| Min Tank Size | 10 gal | 10 gal | 20 gal minimum together |
| Diet | Herbivore | Omnivore | — |
| Care Level | intermediate | beginner | — |
Tank Requirements for Otocinclus Catfish + Harlequin Rasbora
To keep Otocinclus Catfish and Harlequin Rasbora together, you need at minimum a 20 gallon tank. Otocinclus Catfish should be kept in a school of 6+. Harlequin Rasbora should be kept in a school of 6+. Provide adequate filtration, stable temperature with a heater, and hiding spots to reduce stress.
Species Profiles
Otocinclus Catfish
Otocinclus spp.
Otocinclus catfish (otos) are tiny, peaceful algae eaters that are incredibly effective at controlling soft green algae and diatoms in planted tanks. They are the gold standard for planted tank algae control, often preferred over larger plecos. However, they are somewhat delicate and require established, well-maintained aquariums.
Full care guide →Harlequin Rasbora
Trigonostigma heteromorpha
Harlequin rasboras are elegant, copper-colored schooling fish with a distinctive black triangular patch on their body. They are one of the most peaceful and hardy community fish available, making them ideal for beginners. In schools of 8+, they display beautiful coordinated swimming behavior.
Full care guide →