Wow. What are you doing to match your tank levels? I found that getting a salt closer to my tanks parameters helps a lot as well as doing smaller water changes more frequently. RTN can be caused by a few things. Are you starting your sps down low to acclimate them to the lights? Do you dose alk and calcium? I was definitely more successful when I was able to keep my chemistry tight.
I've been dosing to match what is depleting from my target parameters of
9dkh
450 calcium
1359 mag
Admittedly my nitrates are 9-10 but phosphates at my most recent measurement was at 0.14ppm. Still trying to bring this down... It is falling. I purchased a Hanna phosphorous checker last week so i think my measurements here area pretty accurate.
PH fluctuates between 8.01-8.2 in a 24 hour period. I was hoping that running an airline to the outside would help push this up or stabilize but I have not seeing any real difference. I dose alk around the clock. My refugium light runs at a reverse schedule, with only 6 hours of dark for the plant respiration.
My guess is the phosphates are still causing distress. That, and light acclimation.
Regarding checking parameters of newly mixed saltwater I'm just using the hanna alk checker and ph probe. Then making sure salinity and temps are matched.
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