Quick Stats
| Adult Size | 4–5 cm |
| Minimum Tank | 10 gal |
| Temperature | 21–27°C |
| pH Range | 6.0–7.5 |
| Hardness (GH) | 6–15 dGH |
| Difficulty | Medium |
| Temperament | Peaceful |
| Diet | Herbivore — algae, biofilm, blanched courgette, spinach wafers |
| Schooling | 4–6+ rec. |
Tank Setup
The Otocinclus (Otocinclus vestitus) requires a minimum tank size of 10 gal. For a species this size, a larger tank is always better — more water volume means more stable parameters and a healthier environment.
Water parameters should be maintained within the following ranges: temperature 21–27°C, pH 6.0–7.5, and hardness 6–15 dGH. These fish are sensitive to water quality — test regularly and maintain pristine conditions.
Provide appropriate hiding places, a suitable substrate, and open swimming space to match the natural behaviour of this species.
Tank Mates
Otocinclus are peaceful fish. They work well in community tanks with similarly-sized peaceful species.
Compatible tank mates include: Neon Tetra, Cherry Shrimp, Pygmy Corydoras, Harlequin Rasbora, Ember Tetra. Avoid housing with aggressive or much larger fish.
Schooling requirements: 4–6+ rec.. Keeping them in adequate numbers is essential for their wellbeing.
Diet & Feeding
Otocinclus are Herbivore. Their diet should reflect their natural feeding habits.
Herbivore — algae, biofilm, blanched courgette, spinach wafers
Feed small amounts 1–2 times daily. Only provide what the fish can consume within 2–3 minutes to prevent overfeeding and water quality issues.
Common Health Issues
Like all aquarium fish, Otocinclus can be susceptible to common diseases including ich (white spot disease), fin rot, and bacterial infections. This species can be sensitive — maintain excellent water quality to prevent health issues.
Prevention is always better than treatment. Maintain stable water parameters, avoid overfeeding, quarantine new fish before adding them to the main tank, and perform regular water changes. Test your water weekly and address any parameter spikes immediately.
If disease does occur, isolate affected fish in a quarantine tank and treat appropriately. Always research medication compatibility before use — some treatments are toxic to invertebrates and scaleless fish.
Breeding
Breeding Otocinclus requires specific conditions and may be challenging for beginners.
Provide appropriate breeding conditions — caves or hiding places for egg-laying species. Condition breeding pairs with high-quality foods before attempting to spawn them.
Research specific breeding requirements for this species before attempting it.
Frequently Asked Questions
What size tank does a Otocinclus need?
A Otocinclus needs a minimum tank size of 10 gal. However, larger is always better — more water volume means more stable water parameters and healthier fish.
Are Otocinclus easy to keep?
Otocinclus are rated as Medium difficulty. Some experience with aquarium water parameters is recommended before keeping this species.
What do Otocinclus eat?
Otocinclus are Herbivore. Feed a varied diet including algae, biofilm, blanched courgette, spinach wafers.
Can Otocinclus live with other fish?
Otocinclus are peaceful. Compatible tankmates include: Neon Tetra, Cherry Shrimp, Pygmy Corydoras, Harlequin Rasbora, Ember Tetra. They work well in community tanks with similarly-sized peaceful fish.