yes, that is probably the problem. I think most corals prefer about.025.
It seems like a few people have this problem and just get one that doesn't like to open. another thing is they don't like to get sand on them.
I'd say besides raising the saliity, just leave it alone so it can settle inand maybe it will open eventually.
good luck! 
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Current Tank Info: 2.5g pico reef: 5-15hob filter, 10w led light,Stock;neon goby,Pom Pom crab,hermits, astrea, margarita, nassarius, micro brittles, shrooms,palys, xenia, galaxea, zoas,ricordea, litho,chalice,leather,pocci,.WISH LIST:sexy shrimp
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