Hard to tell, never counted. Probably around 1000 but 2'-4' fraction is far smaller than you think, perhaps 200. Far from the biggest, far behind Ohio Fish Rescue for instance; but I am not chasing numbers, I am chasing species and their size, I'd rather have 50 six-footers+. Monthly feed bill is roughly $300. The killer is the electric bill, currently at $1500 per month.