Have you changed or upgraded your flow anytime recently.. Mushrooms I find, inflate larger when they are in lower flow areas. Also lower light (but not low light) also seems to promote mushroom 'fluffiness'.
With the zoos, did you check for parasites and perform a dip before putting it into your tank... look for irritants like worms, snails, etc between the polyps... if you see detritus, use a turkey baster or powerhead to blow it off...
Sometimes all they need is time to get used to their new environment...
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