ok, i finally got my bait tank up and running. had a little trouble figuring out what kind of filter to use, but i have it now. i have been feeding my bait (goldfish and minnows) dry dog food. i have one goldfish that has survived for a couple of months, but everything else died. i think improper filtration caused their demise, but i am not sure. is dry dogfood ok for food? i surely ain't gonna buy fishfood - too expensive. what does everyone else use?