In setting up my new 65 gal tank, I've come to a point where I need some help... My lighting will sit on top of my tank via mounting brackets and now I need to know if a glass (or acrylic) top would be the best way to go or not. I have 3 very interested kittens that I would like to keep out of the tank, for the the inhabitants sake & their own! My question is this: Once I do get my octo, will a top like this inhibit the oxygen and carbon dioxide flows in and out of the tank? I will have an open sump underneath the tank, but will that be enough if the tank above is closed off? Perhaps some kind of (secure) screening would be a better way to go? Any suggestions would be greatly appreciated! Thanks!!