Just a pair of one or the other. Although it's better to have two females and one male. The male will aggrevate a single female.
Carol
Thanks for the advise. It's not for now, it's for much later down the road. Another question, Would a ram(1 male and 2 females) and a krib(1 male and 2 females) be fine in a 36 gallon tank by themselves?
Tom
Rams prefer soft water and Kribs prefer a slightly hard water. Most fish can be acclimated and I have kept Rams at 7.2-7.4ph successfully but I don't have personal experience with kribs so I don't know how hard they are to keep.
As for aggressiveness they both can be fierce during spawning so I'm not sure 36G is big enough.
Carol
I really would not try to do a group of both fish in anything less than a 55.
Both stake out their territories on the bottom of the tank, so you need lots of floor space if you want to try both in the same tank.
It probably is too small.
If one of the pair gets aggressive, the other fish has no chance at all of being able to get out of harms way in a tank as small as 10 gallons.