Well I picked up a 125 and a 75 - and thinking about getting some Kaiser Icola's. I was going to start them in the 75, while I build up the 125. So I was looking to get 20 - 25 1.5 - 2" fish, but I have only been able to find 5, 9 or 15. So my question is can you mix the same type of fish with out too many problems?