Hairy Mushroom not opening

[the_rider]

Hi,

I have 3 hairy mushrooms around 5-6 inches in diameter. For a week now, I noticed, that one is not opening when the light goes on, one of my clown is hosting it at night. Is this the reason why he's not opening ? My clown is hosting him for a couple of month now and I only notice this "non opening thing" since sunday or so.

Thank you

 

[the_rider]

Nobody have an idea what is causing this to happen ?

 

[Kenmx10]

How high is it placed in the tank? And is it near a powerhead?

 

[the_rider]

They are place round 1/3 to 1/2 of the tank from the bottom. In a really low/mid flow spot. They are on one side of the tank. 2 powerhead on the same side but direct to the other side so they only receive residual flow from the powerhead.

It open up again and didn't see it close since I post and he's is even bigger now.