I am doing a teardown after my betta passed a few months ago from a mystery illness, trying to find a cause while I start the tank fresh, JUST in case. I noticed the driftwood has these little hard balls all over it. It's not soft like algae, they feel like little pebbles and only come off if you really scrape. The only thing google will tell me is black beard algae, but I did not think algae could be rock solid. Does anyone know what this is?
https://www.reddit.com/gallery/1pwh3l5
Posted by funtimescoolguy