it doesn't really matter what it is.right now we're sticking with plecos and cats.i think 8'' is a little too big right now.we're sticking with 2 to 5'' range right now.
no just fish that don't grow so quick.i have a 220 for bigger fish but i'm trying to do a 125 in just small fish and the redtail is getting bossy already.i would put him in the 220 but he's not quite big enough.