Hair algae!

It's bad if the look bothers you. Otherwise, it's an indication of a healthy tank. Amano shrimps and Florida flagfish, and sometimes, rosey barbs will eat hair algae.
 
I invested in some ottos and a couple of Siamese Flying Foxes (SAE's) and they don't seem to touch the hair algea in my tank. I think it looks awful :/

Good old elbow grease and an RO unit to reduce/eliminate phosphate in my tap water is my next tactic.
 

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