I have 2 RBPs in a 75 gallon right now, but I finally saw a RBP at the petstore that might work, and isn't overpriced. Theres one I want to get that is about 8 inches I would guess, and mine are now 6 inches (just measured yesterday). So, I know that you should mix the tank decor around, do a water change, and then re-introduce all of the fish at the same time. Anyone have much success doing this? Thanks, James.