I took an old betta cup and drilled two rows of holes around the bottom. Then I took a long airstone and cracked off most of the length so it's just an anchor with a hole at the end. After hooking it up to an air line and pump, I lowered the 'anchor' into the center of the bottom of the cup and buried it in small gravel. Ta-Daa! Instant tiny filter for a snail. I'll just seed it with filter muck and it's good to go. Took me about seven minutes. Any problems with this idea that you can think of?
