This reminds of something, One time I was at a petsmart that was unfortunatly the only place around to get what I needed, and when I got there I noticed that the whole aquarium area was being rebuilt. I know the manager there and we went into the back and discussed the filtering setup they were installing. The unit they were replacing was basically a hayward pool filter and pump. I just happend to know about these things beacuse I used to sell them and such. What was funny about this is that the model they were using used a paperlike mesh that trapped free floating debree. They always had so many snails and now I know why, it acted as a perfect breeding surface. Now I wonder if there was anything cheaper they could have used.