Maintaining the levels of trace elements in the water by performing regular water changes or the addition of commercially available supplements also seems to be important. Charles Delbeek mentioned that iron supplements could benefit the zooxanthellae in the anemones. Moderate current, in addition to clean water, helps exchange needed elements and rid the anemone of waste products. Feeding your anemone Feeding can range from 3 times a week to once every 2 weeks. Some aquarists have had success not directly feeding their anemones at all, although I suspect their anemones are capturing food that is meant for the fish.
Food usually consists of a piece of raw shrimp about the size of the anemone's mouth.
Lance fish, silversides, clams, scallops and other frozen marine organisms can also be used, but I find them more messy. A large bag of peeled and deveined shrimp can be obtained from one of the local discount supermarkets and may last many, many months and has the added advantage of being fit for human consumption. The jury is still out on vitamins. I could not find any common thread in my data that would point towards them being helpful or harmful. My suggestion would be to use them sparingly, or not at all.