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very low nitrates and phospahtes

Your efforts to control parameters are strong but the zero measures of nitrates and phosphates demand investigation if you are providing large amounts of food. When using skimmers or manual removal methods to eliminate nutrients it sometimes leads to overexcessive removal of essential nutrients even though high feeding occurs. The good growth of your SPS indicates nutritional requirements but you should consider providing additional food for optimal well-being.
 
What test kits are you using? A reading of "zero" is not actually zero, it just means that the level is lower than your test kit's ability to measure it.

The attached paper takes an interesting viewpoint of the relationship between corals, zooxanthellae and nitrogen. Worth a read.
 

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What test kits are you using? A reading of "zero" is not actually zero, it just means that the level is lower than your test kit's ability to measure it.

The attached paper takes an interesting viewpoint of the relationship between corals, zooxanthellae and nitrogen. Worth a read.
using hanna and salfret for mag. i should have my icp test back next week
 
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