I currently have a 20 gallon FOWLR tank. It is 30 inches long, 8 inches wide, and 19 inches tall. It also has a biological trickle filter and average flow. The live stock include a soon to be pair of occellaris clowns, brittle star, red leg hermit, and a cleaner shrimp. The substrate is crushed coral and I have both live rock and dead coral as decor(if it was my choice I would have live rock and sand but my dealer had a deal on a pre-setup tank). So I wish to make my tank into reef tank with zoas and possibly a colt like soft coral. I wanted to know what I need to have these corals be happy and healthy in my tank or if I even can. Also I need new lighting so please give suggestions.