I am brand new to the hobby and I am interested in eventually owning a reef system. So far I have a 20 gallon tank with sand and about 30lbs of live rock, some snails, a decorator crab, and a dragon goby. I got a millenium hang on filter and was told that I may not need a protein skimmer. I tried a nano skimmer, but it didn't work very well. So, I am wondering if I need to have a protein skimmer if I eventually want to add more soft corals, inverts etc. I also am looking to buy a 24" orbit light with the actinics. I don't think I can afford metal halides at this point. Anyone have any good advice?