How Often Do Cory Catfish Lay Eggs? Breeding Behaviors & Care Guides

The Cory catfish is a popular option for any freshwater tank and is suitable for aquarists of all levels, from novice to expert.

They are scavengers and bottom feeders. They assist in keeping your aquarium clean by locating and consuming food scraps and other detritus.

Corys come in over 150 species, each with its characteristics and breeding preferences. They prefer mating with the same species and have much progeny.

How often do cory catfish lay eggs? If you are curious, let’s scroll down this article to get an exact answer and care tips for this fish!

How Often Do Cory Catfish Lay Eggs?

The number of Corys kept in your tank determines how they lay eggs and how many eggs they can release.

Is it possible for a Cory fish to produce eggs on a weekly basis? The short answer is yes!

If the water conditions are ideal, a female Cory will produce eggs under the proper conditions every seven days.

How many eggs do cory catfish lay? Each Catfish female can produce 10 to 15 eggs per laying time.

Because not all of the spawns will hatch, you don’t need to worry about a crowded aquarium with Cory fish.

They may lay their eggs in various places across the aquarium, but they often tend to stick the eggs on the plants, decorations, leaves, or the tank’s glass.

As a result, when the reproductive phase concludes, you will find 50 or up to 150 eggs dispersed throughout the aquarium in various spots.

Female Cory fish takes a short break before repeating the breeding procedure.

However, you need to keep at least six Corys in your fish aquarium so that this case can happen.

Maintaining appropriate water conditions in the mating tank can make both genders’ egg-laying and spawning behaviors effective.

Besides, various factors affect the frequency of laying eggs in this fish species.

Like other fish, Cory Catfish require proper conditions for spawning, both in captivity and in nature.

As an aquarist, you should consider these aspects when preparing your Cory fish for spawning.

Tank Conditions

Corys don’t like being in a chaotic environment. Instead, they want a clean aquarium, so you should constantly keep it tidy and clean.

You may even build up their aquarium to seem like their natural surroundings.

It’s better to set up your tank with many hiding places. These catfish feel comfortable and confident when kept in an aquarium with some hiding spots.

Make sure the tank’s bottom substrate is thick and deep enough for burrowing.

Include embellishments that provide different hiding spots, such as caverns. These creatures will be more prone to reproduce if they feel comfortable.

If you keep Corys in a social aquarium, make sure no predator attacks them or eats their eggs.

Also, keeping these fish in groups is an excellent technique to promote reproduction.

Water Conditions

When you notice the tank water is dirty, you should replace it immediately. Contaminated water is unsuitable for Cory fish to survive and spawn.

It would be best if you additionally kept a close eye on pH level, temperature, and other factors.

Apart from these elements, there are a few desirable and ethical aspects you may do to impact the reproduction of your Cory catfish.


Feeding is one of several elements that significantly impact Cory catfish reproduction.

Nutrition is among the fundamentals of any living organism, so you should regularly feed your Corys following their diet.

It isn’t just necessary to feed your Cory catfish; it is also essential to provide it with nutritious meals at the right moment.

It’s best to feed your catfish protein and vitamin-rich food. You should give these creatures food 2 to 3 times a day.

Once the Corys begin to breed in the aquarium, you will quickly see eggs on the tank wall. How to distinguish their eggs from tiny things in the aquarium?

Look for little white jelly-like balls inside your aquarium, most accompanying other eggs. The spawns will have a diameter of around 1.88 mm.

How To Identify Fertilized Cory Catfish Eggs

It’s relatively simple to determine whether or not your Corys are laying fertile eggs. Fertile eggs are brown and beige and hatch after five days.

Unfertilized eggs begin off-white and gradually grow increasingly white. They will deteriorate after a specific time.

Soon after, you must remove them to determine these unfertilized spawns as they will never hatch.

If you keep too many spawns in the same tank with insufficient oxygen flow, the fertilized eggs may develop fungus and turn white.

Thus, you should place fertilized eggs near an air stone or air pump, which helps them hatch quickly while stopping them from growing fungus.

It’s best to raise at least six cory catfish in each aquarium to guarantee you obtain as few unfertilized clutches as possible.

It increases the likelihood of mating couples of male and female Corys.

You may also transfer the spawns to a different aquarium where you wish to raise the fry, as Cory Catfish sometimes may eat their eggs.

Otherwise, make sure there are many hiding spots for the tiny fry in the same tank with catfish parents.

You can see darker patches in the center of the eggs if the water conditions are perfect and the oxygenation supply is sufficient.

Fertilized eggs of Cory Catfish

Fertilized eggs

Reproduction And Breeding Of Cory Catfish

It would be best to have the proper tank setup for your Cory catfish to breed correctly.

It would help if you prepared a tank for breeding purposes. Make sure the aquarium is bare so you can clean it easily.

After that, transfer the breeding groups from the existing aquarium and release them in the new aquarium, stimulating the reproductive rate.

After the Cory females lay eggs and the fry hatch, it’s best to take the parents back to the first aquarium since some Corys may eat their eggs or fry.

Besides, you can set up a dedicated tank for the fry. The Cory cluster will mate in the existing aquarium, where the reproduction takes place.

After that, you will transfer the spawns into a new aquarium.

How do you get your Cory fish to spawn? You should keep them from stress and provide them with protein-rich diets.

You should prepare an aquarium, a heater, and a filter to set up your dedicated tank.


These fish reproduce best in groups with a male-to-female ratio of about 4 to 2.

It’s hard for this species to mate, so it is ideal for raising them in big groups to stimulate natural mating and spawning.

If the breeding season comes, the male Cory will begin the courting routine by pursuing the female ones around the aquarium.

What’s the difference between male and female Cory catfish? You can identify their gender through their size, but only when fully grown.

Males are often smaller, slimmer, and thinner than females. They have a giant belly. If a male discovers a female, he may be resting on her until she lays eggs.

When the female is ready, the male releases sperm so that she can fertilize her eggs.

The whole spawning process usually takes roughly one hour. The female will take brief intervals between egg clusters.

If you want more tips on breeding this species, you can watch this video:

The Time When Cory’s Eggs Hatch

Fertilized eggs hatch within 4–6 days.

Remember that Cory Catfish may eat their eggs, so it’s best to remove these parents to another aquarium after fertilization.

It will increase your chances of successfully bringing a considerable quantity of fry to development following hatching.

Breeding Tank Setup

It is not hard to set up a dedicated tank for these catfish, but you still need to consider some parameters.

If it’s your first time setting up a breeding tank, the following tips will help:

  • Choose an aquarium with a capacity of roughly 20 gallons and high edges.
  • Keep your breeding tanks bottom bare and beautiful sparingly with broad-leafed plants and big pebbles.
  • Install an aquarium heater to keep the water temperature from 70 to 75 degrees Fahrenheit.
  • To help with water flow, use an air pump and an air stone. You shouldn’t add a filter since it might suck up or harm the eggs.
  • Fill your tank halfway with de-chlorinated freshwater. If feasible, synchronize the water quality to that of the existing aquarium.
  • You can also add dried cones or Catappa leaves to your aquarium to prevent fungus from invading the eggs.

After setting up your spawning aquarium, it’s best to condition the catfish for breeding.

Cory catfish Breeding tank setup

Breeding tank setup

Cory Catfish Care Guide

If it’s your first time keeping Cory Catfish for the first time, it’s better to have a deep understanding of the care guide for them.

Tank Specifications

  1. Tank size

Cory Catfish are social fish who like being with one another. Stock four or more to ensure they have a pleasant time in the aquarium.

A hobbyist will require a minimum of a 20-gallon aquarium to keep five. When selecting a tank, choose one that is larger than is necessary.

  1. Tank shape

More massive aquariums are ideal for a group of Corys. Any aquarium with at least 10 gallons should be adequate for 3 to 4 of them.

  1. Filter type

A tank filter must enable a modest to rapid water flow. Corys are accustomed to living in slow-moving and occasionally fast-moving bodies of water.

  1. Substrate

Cory species, in their native environment, need soft sediments. It would be best to utilize a fine sand substrate that is soft.

Before adding fine sand, insert smooth stones under the base. For the substrate, tiny, rounded pebbles may be helpful.

These fish are bottom-dwelling and prefer to live there. If the pebbles are too sharp, it might result in wounds and infections.

  1. Water Parameters

When filling the aquarium with water, do not overfill it. Allow some area for the catfish to take a breather.

Every two weeks, replace the water. For an extended period, food particles left in the aquarium may contaminate the water and cause sickness.

  • Water Temperatures: Cory Catfish prefers 70 – 78 degrees Fahrenheit temperatures.
  • pH Level: The ideal pH range for Cory Catfish is between 6.0 and 8.0.
  • Water Hardness: A Cory Catfish aquarium water alkalinity should range between 3 and 10 dKH.
  • Flow Rate of Water: These creatures enjoy medium water flow because it allows them to grow.
  1. Tank Landscape
  • Plants: Marsilea Hirsuta, Java Fern, Rotala Macrandra, Crypts, Dwarf Hairgrass, Penny Warts, Anubias Barteri.
  • Decorations: driftwood, rock, leaf litter
  • Lighting: from moderate to medium lighting

Tank specifications

Tank specifications


The cory catfish is omnivorous. They consume plants and meat.

Besides, they are scavengers. Although they will happily consume leftovers, they still require a well-balanced diet.

Cory Catfish will benefit from the following foods:

  • Fish flakes
  • Bloodworms
  • Algae wafers
  • Meat chunks
  • Shredded vegetables

You should provide them with food for 2-3 minutes to prevent overfeeding or bloating.

Tank Mates

Corys are peaceful so they can get on well with many species. Here are the best tank mates to keep with these creatures:


Angelfish are stunning cichlids from South America. They live in nearly the same habitats as Corys.




Plecostomus is a famous algae eater in aquariums like Corys. Thus, they will react well to each other.



Silver Dollar

These creatures are peaceful. Although they may eat plants or shrubs, they usually do not harm other fish.

Silver Dollar

Silver dollar

Neon Tetra

They are calm fish. Nevertheless, as they’re so tiny, you need to be cautious about what other species you keep with them.

Neon Tetra

Neon tetra

In A Nutshell

This article has eventually reached the bottom of your question: How often do Cory Catfish lay eggs?

If you keep these creatures in a tank with ideal conditions, the female Corys will lay eggs every seven days.

Besides, we recommend care tips so that you can follow them if you are a newbie aquarist. Thanks for taking your time to follow this post!