So are you talking about one lamp to cover the full 30" length of the tank? If that's the case, you won't be able to position it just 3" above the water because you won't have adequate light spread.
Ninong
P.S. -- The clams would prefer 10,000K over 20,000K.
P.P.S. -- According to Giesemann, the effective light spread of the 150w 10,000K HQI DE lamp mounted in one of their high quality reflectors is 23"x27" with the bottom of the fixture 30 cm (12") above the water.



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