Thanks all.
The gap on the back of my tank is only a few inches around the filter area, and part of the is blocked because the heater cord goes there and the light cord lays over it too. This guy was about 4 inches from nose to end of tail, I don't know how he got through the cords and all but he did.
The gap on the back of my tank is only a few inches around the filter area, and part of the is blocked because the heater cord goes there and the light cord lays over it too. This guy was about 4 inches from nose to end of tail, I don't know how he got through the cords and all but he did.