Mini Cycle

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We ditched the old sand for fresh sand. Some if the LR was not kept submerged so that may be a factor.
 
OK. I did another 55 gal change last night. Tested this morning and the nitrates are still off the chart.

I tested the fresh SW i added and there were no nitrates (yellow w/ API test).

I'm at a total loss here. Could there be something in my tank affecting the test results?

I've tested from the DT and the sump at different times with same results.

I will take to an LFS to compare, but any other ideas?
 
I'm going at lunch. They were closed yesterday and I didn't have time to go to another one!

This is so frustrating because I want to start stocking and my corals and inverts are great! I mean really, doesn't it only take 60PPM +/- to kill a shrimp? I have 2 and they are just fine. Molting even.
 
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