What corals would I be able to grow with this set up..I have the fish need it fixture 4x24 watt 2 actinic 2 10k. 20g tank that has been up for about a month and half finished cycle and stock with 2 clowns and a yellow watchman. was reading softies like mushrooms etc but they all say 30+. can any live in a 20g that has been up for a month? THanks