MH lighting question

[Marcus K]

I have a 90gal tank that is FOWLR and would like to upgrade to metal halide. I picked up a electronic 250W balast assembly and a mogul socket at a local hydroponics shop. Now I need to find a reflector that will fit under my canopy. I currently have two strip light assemblies that are Allglass PC 110watt fixtures that do not allow much room. I would love to keep these and add the MH but I don't know how to make them fit. would it be fine to use one PC fixture and have the MH over towards one side of the tank? What is a good bulb to use in the 250w range? Anyone make small reflectors with a fan?

Thanks
Marcus