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post #2 of (permalink) Old 07-03-2011, 06:19 PM
Planted Tank Guru
Kathyy's Avatar
Join Date: Feb 2010
Location: Newbury Park, CA
Posts: 3,949
I have 150 watt MH over a 24" deep tank and it is very bright at the substrate, 40" below. 2 fixtures over a 5' tank was fine but am going with 3 over an 8' tank as the corners are too dim for my liking, 6' may be fine/may not. Go with 175 or 150 watts if you change the MH and they may need to be raised up even though your tank is deeper than mine. Possibly the VHOs with 6500-1000K lamps would be enough by themselves, usually 2 full lengths of T5HO bulbs is enough for planted tanks, but I am unfamiliar with the strength of VHO.
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