Hi everyone, I'm new :) I'm Dante from Canberra, Australia. I'm also new to aquariums and octopuses. I've been doing lots of research and I'd like to have a cycled tank ready for an octopus by the end of the year. My first big hurdle has been figuring out an escape-proof tank. My general idea is to have a good-fitting glass lid for the tank and a lock glued to it. Then I'd have a corner weir with mesh that goes all the way up to the lid -> sump -> and a drilled hole with the return pipe from the sump glued into it. That way I can keep all the gear in the sump so the octopus doesn't break it or hurt itself. I've spoken to my local dealer who makes tanks but he was extremely unenthusiastic and didn't really want to talk about my idea, so I was hoping you guys could let me know if there's any obvious problems with it. Another quick question I had - just something I'm wondering - does it matter if the sump return pipe is below the water level in the upper tank or not? If it doesn't matter it seems like this would be an easy way to prevent backsiphoning. TIA!