I don't know if it's because the tank is big enough, or because he is bothered by no one, or is it because we have the paludaria-frame above the actual tank as well, or because he is so fat... He is really strong anyway. Once he got spooked by something (we don't know what) and he dropped two full size Eheim 2252 XL:s from their holders in one sweep.
Paludaria-frame? Sorry if that is explained somewhere in here already
I'd bet he's very strong! Have no idea the size or weight of those filters though >.<