Drop Off Reef Tank

[Myka]

Anything filled with air is going to want to float and will be trying to leak from both the wet side and the dry side. I was thinking you could build an L shape out of glass to make the edge, and then where it would meet the tank at the top on the short end you could leave a 1" gap (or better yet leave 6" so you could get your hand in there if needed to seal up a leak or something). Does that make sense? I don't know how to use any drawing programs so that doesn't help.