For me, I had a 20 gallon tank with 6 adult-sized albino cory catfish (to increase my chances of having enough males and females).
Corys are small fish, with most species around 2.5 inches long. But do not be alarmed when individuals pop up to the surface. Corydoras aeneus the 'Bronze Cory' and Corydoras paleatus 'Peppered Cory', there are also albino forms of both species available, which are equally as easy to breed, the ideal breeding group for any of these species would consist of two females and four males. A variety developed from the Peppered Cory, these fish are a pinkish white with red eyes that almost glow. The males will chase around the females and swim circles around them while the females will clean multiple spots in the tank. They look like cory eggs. Warmer waters will also encourage breeding. It will be better if you find a separate tank where the fish can spawn and lay eggs. A breeding tank is recommended, as the parents will happily consume their eggs and fry, so it is necessary to separate the parents from the eggs after spawning has taken place. Cory catfish stocking in a ratio of 2 males to every female produces the best results. Breeding of the julii cory is typical of other cory species. Fertile eggs grow darker in color over time, ranging in color from tan to dark brown. For breeding purposes, we will be lowering the temperature of the water slowly down to 65 degrees F. Sexing Cory Catfish: These fish are not easily sexed. Well you are going to need this guide! Are they still in the tank? Cory Catfish Types Albino Cory Catfish. The smallest ones are just over an inch and the largest is 4 inches long. The eggs will hatch in about three days, and the larvae will move into the plants for several days. Cory Catfish do not breed in the tank too often, but it can be seen when the tank is kept comfortable with consistent lighting. Barbs are notorious as fin-nippers, and they will stress your cory cats. If they are-the other fish will eat them, or the cories themselves will. Cory Catfish Breeding. If you want to hatch them then you have to remove them from the tank or at least put them into a net breeder with an airstone for circulation. After each spawning, the female will deposit eggs on the tank glass, often in an area where water flow is high. (Using a syringe or eyedropper would work) Eggs that are white are usually infertile, but I keep them in there unless they get moldy. How to Breed Cory Catfish Okay, for most of you, breeding corydoras was probably an accident, but here’s what you can do to encourage it. If you have a keen eye, it is possible to tell mature males from females by comparing fish. They look like cory eggs. Monster Catfish - Information about Monster Catfish Spawning Bristlenose Plecostamus (Ancistrus dolichopterus) - After months of inactivity, Twyla's Bristlenose Plecostamus finally decided to breed, and the eggs hatched. A bottom-dwelling schooling fish, it prefers to live in groups of six or more. It takes about 10 days for catfish eggs to mature and hatch. keep in mind that the fish reproduce when they feel comfortable. I have learned quite a bit from my first cory … Once hatched, the babies (called fry) are protected by the male until they are about a week old. The female usually holds a few eggs between her pelvic fins, where the male fertilizes them. This article will discuss Corydoras Catfish types, size, breeding, and eggs. Tutorial: How to not fail at breeding Cory catfish.