The Planted Tank Forum - View Single Post - Why not more metal halide?
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post #2 of (permalink) Old 10-13-2012, 05:36 AM
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i think most people don't have a tank large enough. if you put a MH over say, a 20 gallon tank, the plants will only suffer unless you hang it waaaayyyy up. i've seen plenty of others with 80+ gallon tanks using them, though.
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