I have a cycled 70 gal tank that I'm waiting to mature before I put an octo in it - probably (or hopefully I guess!) I would like to put a briarieus in there. To give you an idea of my tank: it's eurobraced with the 2 pieces cut out on the top. I had put 2 pieces of glass with hinges and locks to octo-proof it, but the heat build up is unbelievable! It's easily over 100 deg here in the summer, and a fan seems to be doing the trick, but not if the top of the tank is sealed. I've found some window screening that I thought may work, but the frame is made out of some kind of light metal... Any other ideas that would make it secure but easily enough to get into when needed?