Just moved my pieds in to 33ltr tubs..put them in the top shelf of the rack forgetting their was a 10mm gap..the male (600g) escaped..the female (1200g) was stuck by the neck, lucky I didnt rip her head off opening the tub, got her out ok eventually..sooooo lucky..found the boy no problem..its amazing how little a gap they need, just to warn others they can flatten their bodies to get under gaps..this gap was just a bit small for the girl