Pocillopora Question (1 Viewer)

[Baboo11]

I noticed tonight that one of my poci colonies has the polyps pulled in tight, the other looks normal. What's up? They are right next to each other & have been for about nine months. No recent changes, just did my bi-weekly water change last weekend. Seems weird when they are right next to each other. The one that is looking unhappy IS closer to an acan that's right below it, but it hasn't bothered it in the past.

Any ideas?

Thanks!

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[Kevin Lake]

Hmmm. Not sure, but mine does that when a crab tries crawling on it.