help with coral set up

[clowninaround]

have got a 150 gallon tank about four months ago kind of a project so i drill to outlets and made a 40 gallon sump with three dividers frist houses protin skimmer and filter second live rock and soon some type of plants not sure what to get (any help would be good) third is retrun to tank oh yea i have to lighting sytems one that came with the tank kind of old but still puts out nice ligth is 5 feet long t 8 and i have bought a ho 5t two 10k and 2 atnics 4 moons. so have my tank up running have my stock life of fish mostly tangs and pair of high end clowns cleaning crew and a starfish(reef save ) then it was going great and i had just a powder blue tang to get and i got ick so i hospitalize all five and have done about 10 20% water changes and add a few soft corals. going to wait six or seven weeks to start fish again .but as i have started with soft coral i have seen to enjoy that and my question to someone is do i need anything else in my set up to house corals i test me cal and coming back good a 420 to 450 any help please