Will this tank be in a basement? What sort of temp fluctuations does the room it's going in get over the course of a year? Even just being inside a cabinet (top and bottom) can cause over-heating issues on my tank in the summer. The AC is set to prevent the house from ever going above 24.5, but at 24.5 ambient, with both the upper and lower cabinet doors on my tank closed, my tank will easily pass the 27 degree mark. While LEDs don't transmit much heat to the water with the light, the units themselves still put out a great deal of heat. It might be less of an issue if the light fixtures were not enclosed in a cabinet. My tank has two 6' long viewable sides, and a 90cfm fan in the ceiling of cabinet that is permanently on. Even in the winter I generally leave the office side upper doors of the enclosure open the help keep the tank cool and the light fixtures cool.
If you had a chiller, or if that tank is going in a room that is perpetually cold, the insulation might make sense year round, but with insulation I can foresee the potential for a dangerous situation to develop. Could you make it removable?
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