First of all, welcome to the forum! Secondly, in the pictures you posted it looks like there is a small space where the cord to the filter leads to the outlet, in the past I've had toads escape out the same way. Duct tape seems to be a pretty good solution. Hope you find the escape artist toad. P.S I've heard they never go for feeder fish. Crickets are the best, I try to sneak in a few mealworms as well.