[Aechele]

This wiped out about 99% of my plants in 2 weeks. What is it? All ludwigia dropped leaves like trees in the fall and everything else was coated. Swords pretty much liquefied, everything else disintegrated.

 

[heatherbee]

Looks like diatoms. Hopefully this link will help!

https://pethelpful.com/fish-aquariums/How-to-get-rid-of-Brown-algae-or-Diatoms-in-freshwater-aquaria