My husband whos on here a lot, said if I had any trouble to get on here. He's out in the field. Anyways I was doing some work around the house and had to shut off power to tank, well one of my pumps wasn't working so I pulled it off fixed the motor and back to normal. However I keep looking at my tank two of my eels are acting like there gasping for air and I noticed the shark breathing hard as well. The only other thing I noticed is the star fish we have looks like its been bitten. Now the tank is 200 gal. Should I be worried or any ideas what could be going on in the tank. Yesterday I did a 20% water change with purified water and sea salt mix. Please help or give Ideas I dont want to be a dead wife for killing his babies.