I would like to share with you my experience of breeding Celestial Pearl Danios.
Three months ago I set-up two 30 litre tanks for breeding Celestial Pearl Danios.
Each tank has twelve fish, a mixture of males and females. The bottom of the breeding tanks have a mesh grid for the eggs to fall through. The eggs do not adhere to plants very well as they are not very sticky. Male Danios love to eat the eggs, so you have to have a heavily planted tank or else a mesh grid for the eggs to fall through which the males can not reach.
I am syphoning about 15-20 fry a week. Some weeks very few or none at all. Either they do not lay many eggs at once, or else the males are eating the eggs that have not fallen through the mesh and that have adhered to the Christmas Moss. The tanks are heavily planted with Christmas Moss (Vesicularia montagnei).
To collect the eggs or fry I shake the Christmas Moss to release any eggs. I syphon the bottom of the tanks (under the mesh grid)twice and week, and transfer any eggs or fry to a 25 litre tank where the fry are raised until they are approximately 5mm in length.
I feed the breeding Danios flake food, mosquito larvae and daphnia.
The temperature of the breeding tanks is set at 22C and use a sponge filter. I have no artificial lighting on the breeding tanks, and I do a 20% water change once a week.
The eggs and fry are raised in a planted 25 litre tank, sponge filter, with no artificial lighting, temperature 22C. The fry are feed twice daily with micro-worms or Wardleys Small Fry Liquid Food. Since there are many different batches of fry in the same tank I also feed brine shrimp to the larger fry.
How I am breeding these fish is not due to any former experience in breeding fish in the past. It is rather I think more to a lot of good luck and reading how others have succeeded to breed Celestrials. So far what I am doing has been successful and I have a approximately 50+ fry.