The true average height might be even closer to 12" since 90% of the fish tanks in the US must be 10 gallon tanks. Talk to an aquarium manufacturer and see how many 10g tanks they make vs the rest of their stock. But regardless, Basilisk is right to say that it is futile to worry over a few inches of height. But for this discussion's sake, red wavelengths are definitely attenuated quickly and the difference between 18" and 22" is significant.
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- Sam P -
plantedtanker in limbo - all tanks currently in storage
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