How old are your test kits ? I am not sure that io levels are out of pail but 990 seems lower than what they would aim for.
How big is your tank, what's in it for corals. I take it your not supplementing your levels.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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