thank you for your comments, its interesting because this is what the fish store reccomended - I guess I shouldn't always listen to them
So If the store is willing to take back the rainbow for something else, is there another fish that someone could reccomend that would get along with my 3 tiger barbs and the paradise, within a 10 gallon tank?
And yes, I know eventually these fish will outgrow this size tank so hopefully when that time comes, I can afford a larger tank. however, now the barbs are not even an inch and the paradise is small, maybe 2 or 2.5 inches max