upon viewing my 55 gallon setup, I realized that the overflow box could present an avenue of escape. If the octo went into the box he/she could zip right up the siphon tube into the overflow box :x . Has anyone had a problem with this?? I guess that I could try to cover the overflow box with net material, but I'm not sure if that would affect the flow or if its necessary. I've attached a pic of the tank. (I have 50 lbs of live rock, but it seems a bit sparse so I'm going to get more today) Thanks I've also included a pic my my DIY wet/dry filter. I built the bio-tower from acrylic.