I've got 2 striped raphael and one bumble bee. I've noticed that the raphael have grown very quickly (even though the LFS said they were as big as they were going to get) one is about 4" and one is about 4.5"(when I got them less than a month ago they were less than 3"). The bumble bee is about 1.5". I just need to know if I need to make different changes in anticipation of their size.