2 T8 bulbs is no where near enough light for that anemone. As far as feeding it....
Underfeed, underfeed, don't feed! Underfeed, underfeed, don't feed! Most losses in captive systems are the result of over-feeding. How many more times do I feel I need to write this? Bunches! Some anemones have been kept for YEARS
without any intentional external feeding. Know your stock! Many anemones (especially larger species) are detritivorous (a polite term meaning they eat poop), planktivorous, and largely chemoautotrophic/photosynthesizing species/individuals that hobbyists try to over-stuff with meaty/prepared foods. My bid for largest cause of loss of anemones is the consequences (lack of oxygen, hydrogen and other sulfide production...) from over-feeding.
Cut it out! Within normal temperatures and other conditions, most can and do do well on weekly feedings. If you're going on vacation, leave them alone.
For almost all varieties kept, an occasional (weekly or so) perfusion (wash?) of live brine shrimp, prepared mash of frozen or dried food, or frappe' (as in with your blender) of "fresh" marine food meant for human consumption (shellfish, shrimp, langouste, not-so-oily fish) with or without supplementation. Temporarily turn off your particulate filters and squirt the food onto their tentacular surface.