Having kept few different types of anemones for long time under florescent, MH,
HO,
VHO, PC and combinations, I really dont understand the all the fuss about anemones. Do know some are more difficult or requires/demands more but should not be too afraid to handle them. Depending on the types of clown, one should decide on what kind of anemone. Just do bit more research on what you want and give it what it requires especially feeding.
One should just make sure one being purchased are not damaged or dont get damaged during bagging . Do remember when ordered dozen anemones of same kind, not all arrived in same conditions thus try purchasing healthy specimen to begin with.
When anemones are mixed with corals, I tend to have less issues/problems with taller tank than shallow tank (less chances of anemone coming in contact with corals).
IMO, 216W of lighting (mixture of day and act, etc) in 15" tall tank should be sufficient enough for most anemones.
Hope this helped a bit.