Drop Off Reef Tank

[lastlight]

What I do like about that idea is there is water on both sides. I think if that void down there is empty it's going to be riskier. I wouldn't even bother having that compartment circulate with the main tank. I suspect that would lead to all sorts of other issues with nutrient buildup etc. I'd fill it with ro/di (in case it ever did slowly seep) and just seal it up. Balancing the forces on both sides would be my main goal.