I'd wait a few months atleast to get things settled out. I'd try and get water change water from someone like david lee or another established tank to speed up the process. I think sailfin just needs enough light over their stuff to sell it and arent providing conditions for long term care. rbtas are known to do well under lower lighting, not all anemones are that way.
I dont directly feed mine, they get good light and water flow and catch some flake and cyclopeeze here and there. An occasional blast of flake wouldnt hurt but for the most part when you have vho, t5, or mh they will live off the light.
hth
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