I have a Oceanic Model 6 in sump skimmer. I have it sitting in the bottom on a 30 gallon sump. Any ideas what i can put underneath the skimmer to hold it up higher in the sump? With it sitting in the bottom i can only fill sump about one third full. Or it will float the top of the skimmer. Can i use a brick or something to put under the skimmer to hold it up higher? Or will it contaminate the tank? Thanks for the advise Duane