In my aquarium, I’ve recently discovered a pebble (from the substrate) that has a bizarre type of algae that I’ve never seen before. It’s bright green, and looks like hair all attached to on point on the pebble. The strands are about 1 cm long, and have been growing very slowly. It hasn’t spread to any other pebbles. I don’t really want to eliminate it, since it’s kind of pretty. So what is this? Where did it come from?
It’s called “Hair Algae”, and you can learn all about it here:
http://www.thekrib.com/Plants/Algae/hair-algae.html
You only need to worry about it if it starts growing out of control, really.
- Rebekka