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Ive seen some of these when i searched it up online and glad i got a opinion, i think a 50W should be alright with my tank i saw this oneI'll never not tout my good experiences with the Nicrew series of black box LEDs. I've been using the 50W with the (purchased separately) lighting controller on both of my marine tanks. I don't however know if you would use the 50W or the 100W on a 40g tank.
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