Fish or Mix

[martinimagic]

I am fairly new to poker and I have a question on theory about micro-limit games? I find it hard to beat the micro-limits with a table full of fish. Always at least one sucking out on a draw. It seems like this would be ideal, but I always do better with some tight-passives at the table. Is there any ideal situation? I would think the stakes have something to do with this.