So just realized there’s long stringy brown algae in places. On my chaeto, my halmidea, my finger leather, and my Xenia has caught some. In the rock work. What is it, what causes it, and how do I remove it? I recently added a bag of phosguard in my hob cuz I’m having a diatom problem. Also two/ three weeks ago I added a new layer of substrate I’m the front. Could any of this of helped bring this on?