joshuacpr99's 75 gal reef tank

----------blue spotted mushrooms------------
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Yea....I think there friends. They do that all day long.
 
MUSHROOM QUESTION............
do they normally stay fully expanded at all times or do they retract their discs at night? they were fully expanded all day, but i came home at about 10:00(2 hours after lights went out) and a few of them had completely retracted their discs. is this normal or should i be worried?
 
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