Carpet closing up more than usual with hermit crab

[carpetlover]

So I have a haddoni carpet anemone, that looks healthy and all, but after I added a small hermit crab, it closed up much more at night than usual. It’s in a nano tank, and the crab is exploring the crap out of the tank. Is everything alright?

 

[Mr. Experience]

Hermits are known to have little to no boundaries when it comes to exploring the tank and crawling over corals. While they usually don't do damage to the corals or eat them away, corals are bound to close up when they feel endangered or like they are being invaded by another organism.