Brain corals released some

How long did you mix the water? Most salt brands contain elements that help facilitate a quicker dissolve time. These components, if not dissolved can burn or irritate coral tissue.
 
If you have a rubbermaid garbage container you can mix your salt in advance, let's say a day or two that way your always ready. Just add a little powerhead in there just to make sure it's mixing.
 
Yeah i wouldnt worry too much about it, my brain seems to release a little slime everytime i move it(i tend to reaquascape too much) and it seems to be back to normal soon after. Its their way of saying you might have stressed it out
 
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