I would like to try to put a fan or fans in my sump to cool down the tank that are a bit quieter than the regular size fan I'm using on a bookshelf across from the tank. I was looking at the Coralvue or Icecap variable speed fans or the Azoo Clip on fans. Since I don't have a canopy I can't install the icecap or coralvue and would have to come up with some kind of mount, maybe something acrylic like on Marc's website. Any ideas? What do you guys use for a sump application?