I have kept one for quite a while now. I feed him leftover squid or shrimp from the grocery every once in a while and also brine shrimp whenever i spot feed my corals. I am running pc's with about 4 watts per gallon. I have heard that they are one of the easier anemones to keep. He's being fed in small doses maybe twice a week.
Oh, and by the way, good luck getting any clownfish to host in him. Mine won't. This anemone is from the atlantic and clownfish are from the pacific. Most just dont seem to recognize him as a good nesting place.