if you are very curious on the net and keep watch for stuff for sale everyday, you can pick up tanks for sale complete, with everything included real cheap. Use the corals in your tank, maybe the fish and inverts and sell the rest back on the net like eBay. The money you make from the sales you can use to buy again. People who give up the hobby are generally keen to get rid of it all, and very ridiculous offers are generally excepted.