I have some damsels too and yes they do love to hide. Im not sure if its typical behavior, they love to hide behind my live rock and before i had the rock one of them would sit in the corner and push out the sand. From the ones i have i would say they're pretty shy, ive read they like places to hide and they'll come out and dart around when im not there but when i walk by they hide. Kind of annoying and i cant wait for my cycle to end to get my perculas. They really like my diy
moonlight and i put in a shell and one of them took it over and is very territorial. I cant comment on the mated pair part.