It's normal for brain coral to do that once settled in they can inflate up to 3 times their normal size
As a warning though I recently lost both my brain coral as I had just worked 25 straight 12 hr night shifts and had all but ignored my tank other than top ups everything in my tank grew but my brains
Brain coral like water with not too much floaties in it unfortunately my water was fairly dirty and my brains took exception to it by the time I took time to look after my tank it was too late for both brains.
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 My aquarium is nothing but a smorgasbord for my cats.....
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