a 150 watt MH will work good on there. I don't know what the concern about 3" off the water is as I have never seen those but I assume they have a splash shield which would make that distance no problem.
the PAR value of a 96 watt MH is no where near that of a normal 175 watt MH so a 150 MH will definitely allow you to keep more and get better results.
Steve
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