I was wondering if anybody has any experience in drilling 125 g Oceanic tanks ? I was planning on running a closed loop filtration system in a addition to my regular open loop. I'm going to drill several holes in the backside of the aquarium for intake and outake. I guess I'm mainly wondering if anyone who has/had an octopus has done this before and what strategy was used. How many holes should I drill for adequate flow ? Should I have multiple intake and one outake or vice versa ? What diameter holes are suggested for the intake & outake ? Should the holes be positioned in a certain way to maintain the glass's structural integrity ? I am extremely nervous about drilling this tank, because I nearly broke my back moving it yesterday, not to mention the $$ spent on it would not be easily replaced. This will be the first step of many with this project, so I want to do it right ! Any input is greatly appreciated !