I just set up a 20g tank for my pair or 3 inch cons and their babies and I ended up buying the Marineland Penguin 350 power filter. The lil filter pumps like a champ and has dual bio wheels and I only paid $14 for it from bigalsonline, they have a crazy sale going on with them. Just thought Id give anyone looking for some cheap filtration a heads up. $14 for 350gph is not too shabby in my book. Happy fishkeeping.