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Hope you can advise me. ok but you asked for it!!
when it comes to nitrate there is no such thing as a "heavy coral load" and a single denitrator with a 1/4"OD tube aprox 50' long in a 14" tall 2" diameter tube will do just fine on a 150gal system (this does assume tank + sump = 150g)
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smile its all good
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