My father has been fussing that he wants a protein skimmer. I bought him 3 marineland c-360 because the fish cabniet was not big enough to hold a sump tank. He was looking through a catalog and now wants a protein skimmer. I was wondering if yall think it is possible for our tank. He has a glass canopy up top, and the bottom cabniet is full. I was think a hang-on skimmer may be the best choice. Thanks!