Otocinclus Arnoldi
A tiny suckermouth catfish that grazes soft algae from plant leaves and glass without damaging either. Peaceful, useful and rather more delicate than its reputation suggests.
Feeding
Grazes soft green algae and biofilm. Must be supplemented with algae wafers and blanched courgette once the tank is clean.
Compatibility
Entirely peaceful and suitable for any calm community. Keep in groups of six or more.
Behaviour and personality
Works constantly across leaves, glass and wood, grazing. More active and visible in a group.
Before you buy
| Important notes |
|---|
| Almost always wild-caught and often arrives thin and stressed, so early losses are common. Add only to a mature, established tank with algae present, never a new one, and feed deliberately once the algae is gone. |
FAQ
What kind of algae does Otocinclus Arnoldi prefer?
Otocinclus Arnoldi prefers soft green algae and biofilm, which it grazes from plant leaves and glass.
How many fish should I keep in a group?
Keep at least six fish together for better activity and social behavior.
Can this fish be kept in a new tank?
Please contact customer service
Boris Knox –
Added Otocinclus Arnoldi to my established tank with plenty of algae. They quickly started grazing on leaves and glass. Very peaceful and active in groups. A little fragile at first, but settled well after a week.
Eric Terry –
They arrived thin and seemed stressed initially. After a few days in a mature tank with algae, they began feeding regularly. Supplemented with algae wafers and blanched courgette. Good for algae control without harming plants.
Alexander Vance –
Kept in a group of six with other peaceful fish. They’re constantly moving and cleaning the tank. No aggression, just quiet grazing. Works best in a stable, established environment.