the tank size is 75 gal with a refugium, i have about 70lbs or more of live rock and 90lbs of sand. i seen that the tank temp was 82 (i turned the heat up in the house yesterday night so that may be why it was so high i dunno so i turned it down to 79. i have not done a water change close to a month because i have been takin care of my wife and our new baby, i am planning on doing a water change tomorrow. what i have in the tank is 5 clowns, 1 sailfin, 1 lemon peal, 1 sand sifter, some snails. the corals i have is a large torch coral, some small polops, 2 bta. i dont have the prizm skimmer running because i was told i didnt have to run it because of the refugium.