No I'm not dosing probiotics anymore as I plan to KISS.

I did experience the STN while dosing vodka. That was when the cyano began. I then discontinued vodka dosing and continued bacteria dosing. Shortly afterwards, the select SPS began to bleach.

I was using that ALK regent that was wrong all that time. So I can assume that my ALk levels were low.

Like how low? Under 7 dKH? That will cause bleaching and STN.

Yes it was around 6.2 dKH. Then with a water change, it raised the Alk levels higher (more than 1.5 dKH that day).

That's a big swing, but that would take a big waterchange of much higher dKH to get that much swing.