oh, and i'm not sure if each of those dots represents a fish (like in the group of chromis and damsels and stuff) but i'll assume that they do..in which case you've got like 12 fish in there. Thats quite a bit for only a 55. I've got only 5 in my 40 breeder and its pretty maxed out (not so much with the bioload....i've got plenty of rock for that, but space wise, there's just not enough room for much more than what i got...In yours it would be way too crazy, specially if you were to get those tangs...those 2 would probably put you over the max bioload with the other fish combined...i suggest at least getting rid of those 2 guys...)