I bought the pump/filter set up from sac-a-lait last year and ran it for a while, but to be honest I had a TON of minnows die off. It was probably something I was doing wrong but anyways, I talked to the man I but my minnows from and he told me he doent filter his water at all. He only uses air pumps and bubblers. I quit filtering and would go days without loosing a single one. He told me the best thing to do is a 20-30% water change two times a week. I'll post up some pics of my set up I have now in a bit. My tank is a Rubbermaid 150 water trough and I keep 5-7 lbs alive. I have two of the big aquarium pumps that have 3 air outlets from walmart.