I have got six cories (three grey cories and three albinos) I would like them to breed. Can anyone help? what should I do? I am used to live bearers more than to egg layers. thanks
Firstly, how old are your cories? Secondly, do you have both sexes? You obviously need both sexes and they have to be mature before breeding, although in my experience, the females have to be mature and the males don't have to be fully grown yet. Females are larger with wider bellies and males smaller and slimmer.
Feeding them a good diet is also very important. We feed ours blood worms, daphnia, brine shrimp (all frozen I'm afraid), and good quality commercial food.
Simulating their spawning conditions in the wild also helps. Cooler water changes and good water flow in the tank also gets them started.
If your corys are bronze and albino C. aeneus, and both sexes are present, they will spawn when they are ready with little or no encouragement. Here's a picture of a pair of mature C. aeneus:
The female is the one at the bottom. While these are fully grown, these corys will usually spawn while they are somewhat younger. This particular pair is wild caught, not tank raised and were not doing too well when I bought them. I kept them in quarantine longer than usual and treated them with tetracycline. When the treatment was over and I did several big water changes to get rid of the medicine, this is the batch of eggs they gave me:
While you might hear advice suggesting drastic measures, don't bother. If you feed them on live blackworms, or frozen bloodworms, then do generous water changes, they will spawn. I would also suggest that you keep the water temperature at 75 degrees F. or lower.
A word of caution: other fish in a community tank will eat the eggs if they can. It's best to keep the corys in a breeding tank until they have spawned. Then you can move the parents back to the community tank.
thanks gus for your replies and I really appreciate the pics they helped me a lot to know the eggs I am used to livebearers more so I have never seen fish eggs before