Oh! I must have misrepresented myself somewhere, I apologize. I only have TWO snakes in total, one ball python, and one dwarf retic. Neither of them are housed together as that would be irresponsible.
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I only called it sort of a tub system, because it's not a full on rack (If I don't call it a rack, I wont want to bring more snakes home). On closer inspection the way he had gotten out was I had forgotten to push the tub all the way in, and he had managed to stick his head out through the gap. In any case, you're totally right, missing snakes are an incredibly bad thing.