Hi everyone! I have some questions regarding my tank/setup/etc. First of all, I have a 75 gal. tank. I already have purchased the cover, Emporer filter (hang on the back kind), heater, thermometer, lighting, all the test kits, water conditioners. I am very confused about the whole protein skimmer/sump situation. I have seen protein skimmers that hang on the back, which is probably the kind I would want. As for sumps, what are they and is there any way that I could have one that was not in the way/ugly looking? I want the clearest water possible so I guess anything that helps is best. I am not planning on having any coral because the fish I want (mostly angelfish and butterfly fish) are known for eating the polyps. Can anyone give me advice on these things and also what type of substrate for the bottom should I get? Thanks![/b]