Thanks John, but I just bought the Bak Pak and generally am very happy with it on my 20L. It has done a very effective job of cleaning up a situation that had deteriorated to embarrassing levels. I would just like to see if I can get more out of the skimmer. Has no one else tried the airstone modification? I'd like an idea of how large a pump to buy without using a LFS as a test ground. I would appreciate hearing from anyone who has done the modification.
Thanks,
Gary