White Hair like Substance on Rocks?

[Eagle_Steve]

Greyish white

The only way to really tell is a microscope. That is how I ID's mine. As for the actual type of bacteria being good or bad, it did not hurt anything and went away on its own. Never had it in a powerhead though.

 

[Kasey Grohowski]

The only way to really tell is a microscope. That is how I ID's mine. As for the actual type of bacteria being good or bad, it did not hurt anything and went away on its own. Never had it in a powerhead though.

It's not in my powerhead, just being blown around by it.

 

[Act1n1c_L1fe]

It's not in my powerhead, just being blown around by it.

have you touched it? another way to tell algae from sponges and bacteria