That is a really nice color of coralline algae you have growing in.
For your hospital tank if you have cupramine in there ( I assume you are treating for something like ick, velvet, etc), then yes, if you remove water you will need to dose the recommended amount for the new water you put in. If you do not the cupramine will be diluted to a lower amount and become less effective. I use prime to lower my ammonia in my hospital tank when needed.
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RSM 250. Clownfish, Fox face, Blue tang, Yellow tang, Kole tang, Clown tang, Coral beauty angel, French Angel, splendid dottyback. CUC, softies, lps, sps.
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