Violet Smudge Spot Cory Care Guide - Aquarium Tips, Diet & Breeding

The Violet Smudge Spot Cory, Corydoras similis, is a charming small armoured catfish with a pale cream to silvery body, a dark smudge-like marking around the head and a distinctive dusky violet or purplish sheen along the rear half of the body. Its patterned fins and dark eye stripe give it a particularly expressive appearance.

The Violet Smudge Spot Cory is native to Brazil in South America, particularly tributaries and clear-flowing waters associated with the upper Rio Madeira drainage in the state of Rondônia. It comes from tropical forest waterways with sandy or fine-gravel bottoms and submerged leaf litter.

A group of Violet Smudge Spot Corys should have at least a 60-litre aquarium, with a footprint of approximately 60 by 30 cm or larger so they have room to forage together along the bottom. Use soft sand or very smooth fine gravel to protect their sensitive barbels, along with driftwood, smooth stones, live plants and shaded retreats. Gentle water movement, open areas for foraging and some leaf litter can reflect their natural stream habitat, while a secure lid is advisable because Corydoras can occasionally leap.

Adults reach approximately 5 cm (2 inches) in total length. Females are usually larger and broader-bodied than males, while males typically remain closer to 4–4.5 cm (1.6–1.8 inches).

Corydoras similis are omnivorous scavengers that feed on small invertebrates, insect larvae, worms, crustaceans and organic material found on the substrate. Offer a varied diet of quality sinking catfish pellets or wafers supplemented with frozen or live foods such as bloodworm, daphnia, brine shrimp and blackworm. Their feeding habits should not be confused with algae eating, and they still require deliberate meals even in a mature aquarium.

These peaceful bottom-dwellers suit community aquariums with other calm, similarly sized fish such as small tetras, pencilfish, rasboras, peaceful danios, hatchetfish and other gentle Corydoras. They should not be housed with large, predatory or highly boisterous species, nor with territorial bottom-dwellers that may monopolise the substrate. Keeping them with other Corydoras species is generally possible, although a group of their own species is preferable.

Corydoras similis are egg-scattering spawners that can be encouraged to breed when well conditioned with varied, protein-rich foods and stimulated by a substantial water change with slightly cooler, clean water. The female carries a few eggs between her pelvic fins while a male fertilises them, after which she attaches them to plant leaves, aquarium glass or other smooth surfaces. Adults may eat the eggs, so breeding tanks or protected spawning areas are useful. Eggs generally hatch in around three to five days, and the fry can be raised on suitably fine foods such as microworms and powdered fry food.

Females are larger, deeper-bodied and noticeably broader when viewed from above, particularly when carrying eggs. Males are slimmer and slightly smaller, with a more streamlined profile.