A club for owners of Parrot Cichlids

Everytime I clean the tank (vacuum and refresh) the fish seem to spend the nightime hours moving stones about the tank floor. They must have a housekeeping concern about their little world.

I have noticed that my parrot fish is a little shy, but he does seem to be getting better, but i noticed the other day, that he has a habit of hiding under the filter and picking up the gravel in my tank and spitting out by the filter. Should i be worried or is this just normal behaviour? (have only had him 1/2 months?)