good advice ^ ^ and i was told by the shop's fish specialist to leave a bit of room at the top of the tank and never fill it up all the way..is this wrong? >.> and i don't really like cories, although plan of my original plan, i heard that cories will just reduce efficiency of the tank in the long-term....i suppose because they still "draw from the environment"? And anyway, i think tiger barbs would fit into my long term plans from what i read they have great personalities, don't frow over 2in usually and arent aggressive to fish who aren's that much smaller then them. Unless i decide to get a bigger fish and they get eaten....that wouldn't be good and i was planning on getting atleast a few sharks. Aww ..now im confused >_<