ya, the top is completely closed with plastic and duct tape, and it was a hitchhiker on a friends lr, believe me he was pissed when he lost around 100 assorted hermits and snails, a couple cleaner shrimp and an algae eating blenny in the matter of 2 weeks! and even more pissed when he had to catch a 1" octo in a 90g reef with about 200lbs lr!
my friend said it best, "finding an octopus in a 90g reef tank is like playing Where's Waldo...except Waldo changes colors, shapes, hides in tiny crevices, then moves when you turn your back!"
Jon