I have this on my 93 cube total volume is probably around 110-120 with sump and fuge, i dont have much bio load in my tank as far as fish goes and the skimmer only works part of the time it seems. I have about 8 fish in my DT and feed every other day. Works great when it has something to skim!!!! as asked before how many are you planning on having in your tank and what will most of the corals be? It may be a little overkill on the tank, but if you plan on going bigger later then it should be fine
Patrick