Well...
I needed new bulbs as mine were quite old and weren't strong enough to support my SPS corals. It took me longer than I thought it would to replace the bulbs, so they weren't getting the light that they needed.
On top of that, I was using a Coralife Hyrdometer, which was giving me faulty readings. My SG was reading 1.026 but turned out to be 1.031.
I blame a combo of the two for my RTN issues. All my other levels are decent (Nitrate under 5ppm, Phos 0.25, Calcium 420, dKH 12)
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