why is it that 1 of my rbp hides 24/7 under this rock in the corner of the tank? i mean he's out n about during feeding but when there's no food in the tank, boom back under that rock. he only comes out for feeding. is there a specific reason? he's only like 2.5" or so. i was thinkin that maybe its a girl marking her territory for breeding in the future? i have no idea, comments?