Thanks for posting this, will be a help to a new person to the hobby, needing a fast efficient rack for tanks. I do have a question thou; It would be helpful if you could explain the foam pad section of your tanks. I believe that you are using this as an additional filter for your fry tanks, water flows through the foam, and the pvc/airline portion acts as an overflow to keep the water flowing. Curious to know how this works and if my guess is correct.