Wy Renegade
Aquarium Advice Addict
What is the science behind it? It has been awhile since I have seen or read anything on a split photoperiod.
Agree with aqua_chem, there is no science behind it. Having tried it on the saltwater side, I can tell you that it will do nothing for your algae problem. One thing I have seen suggested, that is somewhat effective, is to leave your tank completely dark one day per week. This seems to prohibit algae getting started, but does little once it is established. A reduced photoperiod is also benificial.
That might be your problem... Maybe try moving the light higher up above the tank if you can?
In reality, raising a light higher does little beyond spreading the area of light coverage. It takes almost zero effort for light to travel through air, so raising the light is not going to effect the amount of light entering or penetrating in the tank beyond that.
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