The tank is 75 gallon and with the sump it is 90 Galons. That is UK gallons, the skimmer is a turboflotor multi SL skimmer which is for tanks between 500-1000L. I am setting up a reef tank, cannot wait. The first week has just passed so i only need to wait 3 more weeks now. I have made a list of the fish that i am going to put in my tank; i am almost certain that it will be 1 yellow tang,1 regal tang, 2 common clown, 1 flame angel and a blue girlded angel. I would like to keep a blue starfish, are they ok to keep inside this size aquarium?