Now rasboras will give you a definite challenge. And when you get them to breed for you, it's something to be proud of. I use the same water I breed discus in. They like soft water, and slightly on the acidic side. Also you'll need a well planted tank. Any of the broad leaf plants (cryptocorynes) will do for rasboras. Since they lay their eggs on the underside of these plants. I usually get the spawning tank set up before I introduce the breeders to it.
The water I use is from my RO unit. And is around 1.5 to 2.5 dh. Keeping a ph at around 5.8 to 6.5. The ideal temp. around 78 to 82 degrees. I start feeding the fish on live food, and start watching for the females to start filling with roe. When I notice a pair getting ready I transfer them to the breeding tank. Like a lot of cyprinidae's they will spawn early in the morning. After the pair have spawned it's advisable to remove them from the tank, as they will eat the fry.
After around 3 days the fry will be free swimming, and need to be fed on infusoria for the first week or so. Then I'll switch over to feeding them on brine shrimp nauplii. Good luck to you.
