you could risk having the nutrients in your tank drop dramatically fast after removing your fish and your corals may lose a little color. that is an extreme situation that may not happen. i would just feed a little, maybe once a week until you put your fish back in.
They should be fine, but if you want, I would add some newly-hatched brine and/or decapsulated brine eggs, frozen rotifers, oyster eggs, coral frenzy... small, meaty planktonic foods.
I went through the same thing, leaving my tank fallow to treat all my fish in hypo. I ended up just feeding some oyster feast every once in a while, everything was fine.
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