Water parameters
Overview
The tailspot otocinclus is recognized by the large dark spot on its caudal peduncle, as its name "macrospilus" (large spot) suggests. In stores it is often sold together with the common otocinclus, under the same name. Adults stay at 3.5–4 cm.
Like the common otocinclus, it grazes the fine algae and biofilm on leaves and glass without harming plants. Most fish sold are wild-caught; starvation is the biggest risk in the first weeks. It differs from the common otocinclus in that the spot on the caudal peduncle is larger and more distinct.
Tank Setup
- At least 60 liters for a group of 6.
- A mature aquarium at least 2–3 months old with established biofilm; broad-leaved plants.
- 23–25°C, clean and well-oxygenated water; sensitive to nitrate.
Diet
Biofilm and fine algae are its main food. It must be supplemented with blanched zucchini, cucumber, spirulina tablets and algae-based gel foods.
Behavior and Compatibility
Peaceful and timid; in a group it behaves more boldly. It harms no fish, shrimp or plants.
Good companions: Small tetras, rasboras, corydoras, dwarf shrimp, bettas.
Avoid: Large, aggressive cichlids, fast and greedy fish.
A short profile for this species
The Tailspot Otocinclus page has the basics, but the sections below have not been written yet. If you keep this species, write a section from your own experience; it will be published under your name after editor approval.
Tank mates
This list is calculated automatically from the species profile and grows as new species are added to the catalog. Try it in the planner for a definite answer.
Usually compatible
Flame Tetra
Blackfin Corydoras
Polystictus Corydoras
Emerald Cory
Emerald Dwarf Rasbora
Porthole Catfish
Keyhole Cichlid
Geophagus surinamensis
Cryptocoryne Parva
Gold Spot Pleco (L001)
Should not be kept together
Hobbyist notes
Things you won't find in books, learned by trial and error. The most helpful ones are on top.
Change history and contributors
- Page created · October 16, 2026