Newbie question about new tank & Prizm Pro skimmer

[marie]

The water came right out the top. It usually happened right after I cleaned it which I had to do every 2-3 weeks. If I didn't dial it right down it could dump out a couple of gallons of water within less than an hour and it would wait a few hours after I started it up again to do this . It took about a week for me to bring it back to full speed and then I would have a week of awesome skimming then it would then slowly skim less and less until the end of the 3rd week and I would have to clean it and start all over again.