I would cut the silversides into quarter inch pieces at the largest, chopped up is better. Fresh clams chopped up and mysis and brine make good choices too.
Every three days is more than pleanty. In fact, some people would argue that any direct feeding more than once per week is too much. It depends on how much you feed your tank in general.
The following is a quote from Bob Fenner.
"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.
Some authors suggest the use of beef and other foods unlikely to be encountered in the wild. I do not.
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