On Tuesday I picked up a 55 gallon saltwater aquarium with all the rocks and sand and everything already in it off craigslist. There wasn't suppose to be anything live in it. We had to add about 15 gallons of our own distilled water when we got it home, salinity set to in between 1.024 and 1.025. The tank was so high it barely read on my salinity tester so I had to fix their salinity as well. Anyways a few hours after I set it up I noticed a large anemone on a rock. He seemed to be doing well until today (friday) he was fine all day, I was at work and he was fine when I got home, I did some errands and than went to my second job when I came home and went to turn the tank light off the anemone was shriveled up basically inside himself and his little tenticle tips that were exposed were black. Should I pull him out now or what can I do? I didn't feed him yet, the fish store was closed when I got there so I couldn't buy anything for him to eat. Honestly I didn't even know it was an anemone until last night. It looks something like a long tipped anemone. Just a quick search says that sometimes they do shrivel up but what should I look for I don't want the anemone dying in the tank, there isn't anything else alive in the tank, that I know of. If it does die in the tank what can I do to make it safe for future inhabitants? I did a quick test of the water. The nitrates are high and I bought 10 gallons of distilled water to do another water change on the tank tomorrow.