When your tank is fully cycled you "should" be able to add a "tank's worth" of fish all at once. To be extra safe I'd add all the rasboras first, if that's what you decide on. They're pretty hardy, kuhlis would like a more aged tank. That way you lessen the chance of introducing disease or parasites.
Each time you add new fish there is some risk. Study the fish carefully before you buy. No white or red spots or splotches, no sunken or bloated stomachs, no bent spine, no frayed fins or cloudy eyes. Not all diseases are easy to treat & it can be both distressing to you & the fish & can get expensive too. If you can take an experienced fish friend that might be good. An extra pair of eyes may see something you might miss. While you're cycling, practice looking at lfs tanks. When in doubt, wait! I know that's hard, but we want your first experience to be great!
Each time you add new fish there is some risk. Study the fish carefully before you buy. No white or red spots or splotches, no sunken or bloated stomachs, no bent spine, no frayed fins or cloudy eyes. Not all diseases are easy to treat & it can be both distressing to you & the fish & can get expensive too. If you can take an experienced fish friend that might be good. An extra pair of eyes may see something you might miss. While you're cycling, practice looking at lfs tanks. When in doubt, wait! I know that's hard, but we want your first experience to be great!
