So what's the biggest critter that's managed to get into your overflow? I heard a splashing commotion the night before last, only to discover that my 5" bluejaw trigger had cleared the last 1-1/2" of grating to go exploring in my overflow. Eels and octopus are disqualified because they're too good at going for walks, but what else of reasonable size has ended up where it shouldn't in your tank?