How to install internal overflow on established reef tank

[sphelps]

You could buy or make black acrylic overflow boxes then use the bulkhead to hold them in place, no silicone or glue required. You'll need to drill a hole in the overflow box in the right spot for the bulkhead then get an extra gasket. Install: bulkhead - gasket - overflow box - gasket - glass - nut. Or use reverse the bulkhead with flange side on the outside and use only one gasket: Nut - overflow box - glass - gasket - bulkhead. Make sense?

[windcoast reefs]

Originally Posted by sphelps

You could buy or make black acrylic overflow boxes then use the bulkhead to hold them in place, no silicone or glue required. You'll need to drill a hole in the overflow box in the right spot for the bulkhead then get an extra gasket. Install: bulkhead - gasket - overflow box - gasket - glass - nut. Or use reverse the bulkhead with flange side on the outside and use only one gasket: Nut - overflow box - glass - gasket - bulkhead. Make sense?

Yup that makes sense. I would just have to drain the tank below the bulk head and reinstall it with a gasket between the glass and the box.

That seems like it would be the most secure method.