Thanks Victor. So just got home and here's a few more pics of the tank. It has external overflow with 2 x 1.5" bulkheads and the top of the tank is recessed to fit a 1/4" screen top. The return is a 1" single return split into 2 nozzles
The sump has a custom display fuge with a 1/2" bulkhead fed by the return pump. The chaeto was a temporary thing until I can get my reactor finished up.