i just purchased a prizm pro 300g skimmer.now i have a 75g mixed reef tank and a 30g sump.i had decided i didnt need a skimmer so didnt make a chamber for one in my sump.so my sump is just a simple 2 stage sump.1 stage full of macro and the other the return.the water comes in through a spray bar in the macro section(obviously).here is my question.i guess i could make a small shelf about 4 inches above the sand and set it on that in sump.or just hang on the side?does this skimmer work better in sump?