our lfs has a sale on nano cubes and aquapods. they're 120 for a 12 gallon and you get 10 lbs of live sand and a portable refractometer for free with either. so i was eyeing that...i'm going to buy a nano protein skimmer (heard different opinions on them, figured i'd give it a try) im also going to buy a sunpod, nano water circulation pump, and deluxe heater. How much LR should i get, and i want to get the black sand...would that effect anything?