Good Morning RTN

[sumpfinfishe]

Well i woke up early to go into work for some overtime, instead i now have to deal with a major SPS RTN event! Pulled out 6 frags so far and more to go. My biggest concern is the fish as my NO3 are at 40ppm.
I have done one 5gl wc with 10gl more mixing. The tank is only 33gl btw.

My question for you all, in 15yrs i have never experienced a mass RTN event such as this, just a frag or two in previous years. All other parameters are good, so should i pull all the SPS out and cut my losses to save the fish or should i simply continue with water changes all day and try to flush the system to save the remaining sps?