Feeding my sea anemone?

I purchased a sea anemone yesterday and today i fed it a small frozen fish, thawed out of course. At the moment hes got the fish on its side in his grip. About how long does it take for him to finish his fish, and i also purchased a clown fish today, and at the moment hes swimming next to the heater even tho its 81.5 degrees in the tank. How long does it normally take for the clown fish to find his new anemone?