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Has anyone actually measured what kind of temperature differential there might be? I just can't see there being that big a difference in temps, I assume we're talking in the wintertime here, between the water temp and the bottom of the substrate, which is maybe 3, max 4 inches deep. I'd be interested in knowing if any such measurements exist.
If so, what about the reverse? In the summertime, warm weather climates, what kind of temp differential is there between the top of the tank by the light source, and the substrate?
If so, what about the reverse? In the summertime, warm weather climates, what kind of temp differential is there between the top of the tank by the light source, and the substrate?
