if you want the tiger barbs, you really dont have room for another set of cichlid that will tolerate a small space as a 30 or 35g....especially if you get a breeding pair of anything..what type of cichlids are you looking to get? ever seen firemouths? they are awesome ...but if your barbs arent in a larger school than 6, you will probably have some nipping issues but with a larger school of barbs, you dont have allot of room to play with..so either no barbs, or a bigger tank maybe? thats just my opinion
