The central barnacle does glow; the ground around it glows all the time, and sometimes the glow is like what you see in MasoneTi's photos. It waxes and wanes over time.
Also, this is the only barnacle making music - the rest only make the rumbling/grumbling/cracking noises.
Funny. I spent an hour there last night and never saw it glow like that once. I mean, I'll take your word on it on account of the fact nobody seems too concerned by this, but it's never looked like that for me yet in my two visits.
EDIT: For context, a side-by-side of the central barnacle. My shot is the first one, and taken on the dark side of the moon. They're completely different.
2nd EDIT: Also, comparing the two some more I'm not even sure if Masone Ti's picture is of the central barnacle, there's none of the indestructible spikes around it?
In the 2nd shot as well, there's a gas cloud above the barnacle. And you can see the other barnacles in the background aren't lit up the same.


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