Divider Design - Avoiding Flow Rectriction?

[Myka]

I have a 40g breeder that I'm going to put a divider down the middle and have two mini-reefs on each side. The reason is to house two breeding pairs of Bangaiis. I'm going to use either black acrylic or dark smoked glass for the divider. I think it will look cleaner that way, and the pairs won't be able to see eachother which could be stressful for them.

The tank has a sump, and the plumbing goes into the tank on the left and out on the right with a Herbie overflow. In is 1/2" and out is 1". So, how can I get decent flow through the divider? I was just going to drill a 1" bulkhead with a strainer into the divider, but I think it would be ugly. I thought of doing an overflow from one side to the other, which I think is the best idea. What do you guys think?