It shouldn't be. Generally 150s are recommended for 18" depths. Be sure you're measuring from the back/top of the reflector (where the bulb is connected if a pendant, or the top most part of the reflector if otherwise)
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75 gallon with 20 gallon sump in the works.
R. Bacchiega. Tattooer
I didn't smack you, I simply High Fived your face.
I've got so much glue on my pants it looks like a Friday night gone horribly wrong.
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