So, I purchased a running saltwater aquarium off of Craigslist for $100, great deal to say the least. The tank came stocked with a Watchman Goby, Blue Damsel and a Rock Anemone ( or thats what they guy I bought it from said it was) and about 50-60lbs. of live rock. Got the tank home and set the live rock back up with the Anemone close to the top of the tank to optimize the 65W of PC that came with the tank, which I now think is insufficient for this little guy. Went to bed last night and everything seemed fine. Woke up this morning and much to my dismay the Anemone had dislodged itself from the rock and is now chillin in the sand bed( which is not deep at all, bare in some places). I tried to identify the Anemone with no luck and I don't know what to do at this point. Any suggestions, should I move him back up to the rock or closer to the top of the tank. Thanks for any help!