I am new to this hobby. I purchased a 75gal tank about a year ago when I was back in the states. I built my own stand and everything except for the filter. After about 9 months of putting this tank together, I was finally able to get it set up. Live rock is illegal to collect here in Hawaii, or have it imported which makes my case a little more difficult. None the less there are ways ways of getting rock. So now I will start. My wet/dry filter has a protein skimmer built into it from pro aquatics. How do you know if its working right and is it supposed to be running all day 24/7. If i let it run, it will take out about a 1-2 gallons a day of water. I dont really get the mud type fluid that I see alot of people talking about. Can someone help me out with this problem.