Actually, This is what you said as well as my response to your mastery of the obvious........
My imaginary friend Cyberreefer and I installed an electric fence around the tub. It's the same way I keep my velosoraptor contained.
.......It is true that if the octopus can reach out of the top it will probably escape. Do you really think I wouldn't consider that??? That's why Cyberboy, I mean Cyberreefer helped me install the electric fence. Duh!! Someone buy this guy some anti know it all juice for Christmas......