Looking to buy a nano cube. Still dont know which one to get 6g 12g 24g. Im also doing a 55 gallon Reef Ready tank. So I dont want to sink a bunch of money into the nano. I wanted the nano to grown some corals and breed some fish. My question is should I go with the 6 or 12 gallon. If anyone has the 6. How is it and what do you have in there