I have set up a 75 gallon tank about a week ago. I got it from a friend that had it but while he was gone he had a power suge and all his fish died. I got the tank and now i have it . It has about 100 pounds of LR and i am not sure about the san but it is about anywhere from 3-4 in. I added some snails and hermit crabs a couple of days ago. I use a 20 gal sump for the filter and 1 skimmer in the sump and 1 that hangs on the back. I have 2-250 watt medal halides and a 96 watt floresent light that is bluish puple. The tank has seemed to cycled already. Now i need help in choosing some corals and when i should add them. Any advice on the tank would be appreiciated.