My purple tang was nipping at an open brain for a month or more before I separated the two. I think I only ever saw him do it once because he vary rarely would. If you cant move the brain to another tank you can build an egg crate cage to put around it. If it starts to expand again you'll know if something was picking on it.
If you're magnesium was nearly 0 thats a pretty big problem too... can we have a list with all of the parameters you can test for?
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