MemnochsKat;I once bought a blue lobster but it kept escaping and can only presume it was via a little hole where my wires came out of the lid,how it did it I dont know as its only a small vent !!
it did it several times as did some little red crabs I once bought which was ob how they got out as they were tiny but still to this day dont know how larry the lobster as we named him escaped!
sold him back to the petshop in the end,just thought Id best warn you before hand lol as theyre not the easiest thing to catch,not when ur squeamish like me lol
dianne