Well Nancy, its clearly unhappy with something in the tank, so we're gona need lots of details about your setup. If you could take some pictures of your tank, and especially the anemone when it flips upsideown that would be very helpful. photobucket.com is a great free image hosting site and easy to use
After that, a cadre of questions, try to answer them as detailed as possible:
What lighting does the tank have?
How old are its bulbs?
Where is the anemone placed in the water column?
How big is the tank?
What filtration do you use?
How much LR is in there?
How old is the system?
What are the following water test results: ammonia, nitrite, nitrate, pH, phosphate, calcium, alkalinity, temp, salinity?
If you can't take some of those readings, perhaps your LFS can help you out.
What kind of anemone is it?
Whats your water flow or tank turnover like?
What livestock is in the tank other than the nem and two clowns?
Anemones are very demanding creatures and one of the more difficult animals to keep in a reef aquarium. If things are not just right they will suffer and possibly perish
I hope we can give you some advice to help you out. While you wait for other responses, go ahead and read the
Anemone Sticky by Chac which may shed some light on your situation.
Good Luck
