Trough is good, Alot of inflateables and hardsided, soft bottomed kiddie pools are made of cheap plastics that outgas fish killing crap. If it has a strong plastic smell when new don't risk it. The little $8 hard plastic kiddie pools work well for things like zebra dianos, guppies, and cory cats as summer breeding tanks but anything bigger tens to jump out. I lost some breeding african butterfly fish that way. They are aslo feeding stations for racoons and ravens, etc. As for cheap filters, you can make box filter from 5g buckets, just have the water pulled down thru it with an inline pump and the out flow forced thru a sprinklerhead for areation.Caveman said:Go to a local feed/farm store and see what they price plastic ?trofts? at. Local feed store here sales 150 gallon trofts for roughly $70-80.