If you have other inhabitants in your tank you feed I wouldn't be too concerned about direct feeding. But, considering your lighting issue, I would direct feed the anemone, at most, once a week. If it doesn't like the water flow etc., it will move itself. Allow it to move freely, don't interfere unless you must. Sorry to say but don't feel too bad if you lose it. A tank as young as yours is detrimental to an anemone's health even if your water seems stable. Also, regarding the Kent additive, never add anything you don't test for and know what the proper numbers of each element should be. You would be much better off just performing regular water changes of 20-25% to replenish any depleted minerals, etc. Always research BEFORE adding new additions. Good luck.