I'm looking for some help in modifying my new Red Sea Max 250. I need to seriously Octo proof this tank. I want to start with a Merc, but gradually over the years I plan on going for different Octo's. Maybe all the way up to a Bimac. provided my tank be sufficient. I'm so meticulous about everything and take my time in doing it. I'm almost done with the Biocube 29's but since I bought the RSM I stopped on the 29's. I'm looking into having a thick peice of Plexiglass made for the inside to block the Octo from getting out. I want to pay great detail to the filtration aspect of this large tank. I'm trying to figure a way to block the vent for filtration without blocking it permanantly. I want something I can slide in and out when I want to clean it every morning. But I want it to allow the water to flow through enough so as no debris gets caught. I don't plan on feeding and leaving carcasses in there, but want any small floating thing to be able to pass through the screen and catch on the filter pads. I haven't been able to find any screen large enough for what I'm considering. I also have no idea on how to modify a tank. So any detailed suggestions if you know anything about a RSM 250, please chime in. I'm all ears! Here are a few photos of my dilema.