Yeah, you're right. That is bryopsis. My PO3 and NO3 are undetectable, but the story is like this:
- 2 month ago, PO3 was 0.05 and NO3 0.5 - I am running nitraguard. Also I started to dose kalkwasser with ATO. Ca 440, alk 7
- 2 weeks ago I added vinegar in kalkwasse (15ml/1teaspoon) - suddenly NO3 and PO3 went to zero. Ca 420, alk 9, Mg (will buy a test tomorrow)
After I added vinegar in kalkwasser, I noticed more PE, and those white strings.
The only new addition is a seaslug to take care of bryopsis, which is turning white since NO3 and PO3 are down to zero. I have to start mg treatment. Reluctant though.