How much can I put in a 6 Gal. Nanocube

I have a nanocube 6 gallon, I am going to put 10lbs of live rock in it, and I am going to put a 2 inch bed of live rock in the bottom. I want to build a tank with corals, inverts, and either a pair or single clownfish. What do you think I should put into it, I am going to run premade saltwater and the stock lighting and filtration system unless there is a low cost alternative. I can't afford the bigger tank or space so this is what I have got.

Thanks in advance.