I had 5 juvi redbellys in a 40 gal. breeder. I was gonna upgrade the tank in a month or so. Guess I was a little late The three big ones attacked an killed the 2 little ones. Will they be fine without a upgrade for a little while? They seem to get along with the ones still in there. Even leave him little peices of food because his mouth is smaller. They like carry the food an drop it in front of him. Rather neat to watch. Its like there sharing, though they ate his brothers. Wich makes me little upset because I thought they would be alright in there for another month or so.