Help me identify this algae/build up.
*I'm sorry, just realized I may have posted this in the wrong forum"
Hi everyone. Just started my first Iwagumi a few weeks ago. I started to notice this growth or build up on my rocks. I've dealt with almost every type of algae in my previous tanks but I have never seen this before.
It is almost the same color as the substrate, Amazonia Soil. It seems to dissolve when I scrape it off. It is also weird how it is appearing on the rock, almost in a set pattern.
Could this just be build up of free floating soil particles? Or is this some type of algae I need to be ready to combat? Or something entirely different?