The Planted Tank Forum - View Single Post - planting bulb vs cfl help
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post #12 of (permalink) Old 08-29-2012, 07:19 AM
Planted Tank Enthusiast
Join Date: Oct 2011
Location: Dallas, TX
Posts: 997
When you submerse, i'd say at least 5-6" above the surface. For DSM, experiment. if the top of the tank is hot to the touch during photoperiod peak, then raise it some more. depends on the type of bulb you have, ambient temp in the room, length of photoperiod, toughness of the plants, etc.
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