i'm looking for suggestions on sps corals for my 55 gal. with 40long refugium,100 lbs live rock,130 lbs sand. it's been running 2 years now. i've been keeping easy corals like mushrooms,zoo's,frogspawn(started as a y shape and now has 7 branches),tubeastea sun corals(yellow,orange,black)the black has reacently spawned 4 polops all in different places in the tank,and gorgonias. my lights are 4-54ho t-5,w/ 4 moon. i use 2-10,000k and 2-460nm actinic. my refugium has 2-54ho t-5. 1-10,000k/1-460nm. i was wondering if i could keep any acroporas or any thing tree like,branching. just something that build structure. everything i currently have except the frogspawn is just going to spread around my rocks.