ky,
I got a couple of questions for you. What kind of anenomes do you have? What kind of lighting on the tank with the anenomes? I have 2 condys, 1 flower, and a curlique. The only ones that I feed are the condys. The flower and the curlique get whatever floats by them. I do feed my fish live and frozen brine, and do add supplements. I have not had any problems, but then these are the easier anenomes to keep.
Fishsense,
I got a couple of questions for you also. How long have you had the anenome? What are your nitrates? The mouth should not be open unless it it releasing waste products. The best time to feed is more that likely during the day, when fully extended. I am sure in the wild, when food gets caught in their tenticles, they will eat regardless of time.
The frequency of feeding would depend on the amount of nutrition that the anenome gets from the symbiotic algae. I feed mine about once a week or so usually when I remember, and I feed them silversides. It really does not matter whether the clown is in or out. Try cutting the silversides into smaller pieces, and make sure they are completely thawed.