I am about 2 weeks into my cycle and I currently have a HOB filter. It will be live rock, live sand, and fish, in the tank. With it being a 22 gal tank, is it really necessary to have a sump/skimmer/overflow? I understand they are good for the fish and the quality of the water, but since there will not be corals would the water quality be good enough for the fish? \n What fish would you say are the most tropical looking, and would be a good size for this tank? Now it has been 2 weeks, should I be seeing algai yet?