i just set up a 38 gal innovative marine rimless tank and i have 2 lights they both have 15 1 watt leds in them 1 is 14k the other is 456 nm actinic blue innovative marine says each led puts out 120 lumens,the tank is 18 inches deep so do you think 2 lights is enough or should i add another 14k or will these lights never be enough i would like to have a clam in the sand ?
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