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lighting with MH???????

I use a 175 watt MH over a 36x18x24 deep tank and can grow most plants.  For a
48" long tank you might want to consider two lamps to get an even pattern.  A
pair of 150 watt bulbs would give you more than enough light.  BTW, I've tried
10,000K, 6,500K and 5,500K lamps, the 6,500K works best, IMHO.