I am in the process of building / finding and engineering a tank to keep an octopus. I was just wondering what the Tonmo community thought was the best way to build an overflow and/or refugium. Personally I really like wet/dry filters and will be using one on my octo tank with an aquaripure (http://www.aquaripure.com/testimonials.htm?gclid=COG7ztvtwLMCFSHHtAodSHgAjw) nitrate/nitrite filter, and a protein skimmer built for bigger than my tank size (looking for a 65 tall or a 75 gallon), and lots of live rock and live sand for extra bio filtration. I was thinking of putting some window screening over my overflow / powerheads in order to keep my octo's arms from getting hurt. Maybe some pantyhose? Or a hair net? I want something that wont necessarily block much flow but will be strong enough and small enough to keep the octopus from getting in there and playing around. I definitely dont want them getting hurt! Heater will be in the sump so there is no issue there with burning. I would greatly appreciate any suggestions!