Hi
You would need two units, one would not do it on 36" in fact even two would be pushing it unless you raised the lamps to a good 24" off the water, but as you do not need huge Par then you may get away with this.
The colour is good, I cant say I am the best expert in the field, I can only say what I see from previous lamps (T5 and HO) and that is they more than match my expectations.
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