Corydoras Premium Mix (Corydoras spp.) 3-3.5 cm

Overview

Corydoras premium mix is a carefully selected assortment of small Corydoras catfish, supplied at around 3-3.5 cm. These charming South American bottom-dwellers are loved for their gentle nature, constant activity, and social behaviour. As a mixed selection, you may receive a variety of closely related Corydoras species or colour forms, all chosen for compatibility, hardiness, and suitability for the home aquarium.

Corydoras are one of the most popular freshwater fish groups for good reason: they are peaceful, engaging to watch, and excellent additions to community tanks. They spend much of their time foraging along the substrate in small groups, using their sensitive barbels to search for leftover food. Although they are often described as “clean-up crew” fish, they should still be fed properly and not relied upon to survive on scraps alone.

This premium mix is ideal for aquarists looking to build a lively shoal of small catfish that will bring movement to the lower levels of the tank. They are best kept in groups of six or more, where they feel secure and display their natural behaviour. With stable water conditions, a soft substrate, and a peaceful community setup, Corydoras can thrive for many years.

At Tropical Fish Co, we carefully pack our livestock for safe transit, with fast UK delivery and a live arrival guarantee for peace of mind. Please note that as this is a mixed product, exact species may vary depending on availability.

Care at a Glance

Origin & Natural Habitat

Corydoras catfish are native to South America, where they inhabit a wide range of freshwater environments including slow-moving rivers, floodplains, tributaries, and shallow seasonal waters. Many species come from the Amazon and Orinoco basins, though the genus is widespread across much of the continent. In nature, they are often found over soft sandy or silty substrates with leaf litter, submerged roots, and dense marginal vegetation.

Their natural habitat explains many of their care requirements in the aquarium. Corydoras are adapted to gentle water movement, warm temperatures, and soft, clean substrate that will not damage their delicate barbels. They are not true scavengers in the sense of living off waste; instead, they are opportunistic omnivores that sift through the substrate for small invertebrates, plant matter, and detritus.

Because they are schooling fish, Corydoras feel safest in groups. In the wild, this social behaviour helps reduce stress and improves foraging efficiency. In the aquarium, a proper shoal encourages more natural activity, better colouration, and a more confident fish.

Tank Setup & Water Parameters

A well-planned aquarium will help your Corydoras premium mix settle quickly and remain healthy. The most important factor is a soft, fine substrate such as sand or very smooth rounded gravel. Sharp or coarse gravel can wear down their barbels and lead to infection. Provide open areas for foraging, along with some cover in the form of driftwood, plants, caves, or leaf litter.

Filtration should be efficient but not overly turbulent. Corydoras appreciate clean, oxygen-rich water with moderate flow. Regular partial water changes are essential, as they are sensitive to deteriorating water quality. A mature aquarium is strongly recommended, as newly set-up tanks can be unstable for bottom-dwelling fish.

When planning stocking, remember that these fish are social and should not be kept singly. A group of six is the minimum, but larger groups are even better if your tank size allows. They are active foragers and benefit from a varied layout with both open substrate and sheltered areas.

Recommended parameters for most small Corydoras species are:

• Temperature: 22-26°C
• pH: 6.0-7.5
• Water hardness: Soft to moderately hard
• Tank size: 80 litres minimum for a small group, larger for bigger shoals

Stable conditions matter more than chasing exact numbers. Avoid sudden changes in temperature or chemistry, and acclimate new fish carefully. If you are keeping them with other tropical species, choose tank mates that share similar water requirements and a peaceful temperament.

Feeding Guide

Corydoras are omnivores and should be offered a balanced diet that reaches the bottom of the tank. A high-quality sinking pellet or wafer should form the staple, as this ensures they receive enough nutrition even in busy community aquariums. Supplement this with frozen or live foods such as bloodworm, daphnia, brine shrimp, and chopped blackworm where available.

They will also accept some vegetable matter and benefit from a varied diet. Feed once or twice daily in small amounts, ideally after lights dim or when the fish are most active. Make sure food reaches the substrate rather than being taken entirely by mid-water fish.

Do not assume Corydoras can live on leftovers alone. In a well-stocked community tank, faster fish may consume most of the food before it reaches the bottom. Target feeding sinking foods helps ensure all fish get their share.

Tank Mates / Compatibility

Corydoras premium mix is best suited to peaceful community aquariums. They are non-aggressive and should be housed with calm fish that will not outcompete them or nip at their fins and barbels. Good companions include small tetras, rasboras, peaceful livebearers, dwarf gouramis, honey gouramis, apistogramma in suitable setups, and other gentle community species.

They can also be kept with other peaceful bottom-dwellers if the tank is large enough and there is sufficient space. Avoid aggressive cichlids, fin-nipping barbs, large predatory fish, and boisterous species that may stress them or dominate feeding time. Sharp décor and rough substrate should also be avoided to protect their sensitive mouthparts.

As a social species, Corydoras do best with their own kind. Keeping a proper shoal is more important than mixing them with many different bottom species. If you want the most natural behaviour, choose a group of the same general size and temperament, and provide plenty of floor space.

Why Buy from Tropical Fish Co

At Tropical Fish Co, we take pride in supplying healthy, well-conditioned livestock for UK aquarists. Our Corydoras premium mix is selected for quality and suitability, making it a great choice for both new and experienced fishkeepers looking to add movement and personality to the lower levels of the aquarium.

We use careful packing methods to help your fish arrive safely, backed by our live arrival guarantee and fast UK delivery. Our team understands the importance of healthy stock, clear care information, and reliable service, so you can buy with confidence.

If you are building a peaceful community tank, a shoal of Corydoras is one of the most rewarding additions you can make. Their gentle nature, social behaviour, and constant activity make them a favourite among aquarists of all levels.