Help: SPS bleaching and STN

[Myka]

Originally Posted by albert_dao

Probiotics with a kH over 8.2 is just asking for it. Leave it between 7.0 and 8.0.

/experienced Zeovit user here.

Albert, I assume you're referring to this:

Originally Posted by ChizerBunoi

I was dosing vodka at 1ML per day, but stopped it completely when cyano appeared. That was my only form of nutrient control. Only dosing Zeobac (bacteria) to help with the battle against cyano.

Just to elaborate for OP, it's not not the bacteria, but the carbon source. Using a carbon source with higher alkalinity will often cause STN or even RTN. Albert might be onto something though, did your STN and burned tips show up during your vodka dosing or before that or after that?

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.

[Myka]

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).

[Myka]

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