
I am new to owning an octopus and in the process of setting up my first tank to house my new pet. I bought a Red Sea Reefer 250 aquarium (55gallon) with a built in skimmer and pumps that all operate through a downflow system. The top edge of the tank is glass with no need to run pipes, hoses or wires through the top. My question is, if I affix a piece of acrylic (like plexiglass, although thick enough and not prone to warp) should I drill holes for air, if so how much? Roughly what size is the max size of an air hole I should consider without knowing the exact species (I've read the section on what the local fish supplier will know about the species, and yes, it's a "common octopus" "probably from Bali". This tank top that I'm considering will sit flush against the top of the tank with weights around each corner to prevent a strong octopus from lifting the top, please advise if you don't mind. I'll post a picture of the tank as it sits right now without the top
Thanks
Scott