imo, if you dont have the proper lights for it, just letting it feed from the lights can possibly kill it in the long run. Supp. feed is always good for anemones, you can feed them whatever you like. The more you feed your anemone, the faster it will grow. As far as wondering if its eating or not, generally anything that the anemone "holds onto"' it will eat. You can physically see it eating as its tenticles will move the food towards its mouth. I typically feed my anemones once a week, sometime more sometimes less, I guess it depends on if I feel like fattening them up. Anytime you feed your tank your anemone is going to get food, so remember that. I usually feed my anemones formula 1 cubes directly, and thats done by tossing it on the tenticles. You can feed your anemone silver sides, brine, mysis, formula 1 cubes....anything thats out there really. Just remember tho that anemones like to move around the tank without any notice so make sure your powerhead intakes are blocked off with a sponge or are out of reach of the anemone so it doesnt get sucked up. Enjoy your new addition, they are great to have! and let us know how things are going for you.