ok, so root tabs. i have these little fertilizer things i got from my fish store a while back, same idea as root tabs. my lfs uses them and the plants look great. and yes i think the rainbow fish may need to go. i got him when he was smaller and he has been fine, but is starting to get a bit aggressive at feeding time. and if i want my red cherrys to breed and live, cause im pretty sure he is the one picking off the babies of my rcs and ghost shrimp. it may be time for him to go to a bigger tank.