My last (and first) tank back in 2008 had hair algae. I just pulled it/pruned it out where I could, but I left a little in my display tank because my decorator crab liked to put it on top of his shell and he looked like Don King with it on when he would proudly perch on top of my rock and wave his little claws at me.7of9 great post. (I also like 7 of 9) Our tanks don't have to resemble the sea exactly but close is better.
This is what the sea looks like from the Florida Keys to the Caribbean, Bahamas, and the South Pacific.
See that last picture. I think that was the Caribbean, but notice all the fish fry. Those tiny fish are loaded with oil and living gut bacteria and it's like an all you can eat buffet. Almost every fish eat those all day long and one reason fish don't have to put themselves on disease threads asking for help.
Notice the hiding places all over the place? Fish go in all of them. Notice any Home Depot PVC elbows?
I don't either.
In the 5th picture see all the "mulm" or dying algae on the mangrove roots? Healthy stuff. In the last picture we also see hair algae. Maybe we should dose Hydrogen Peroxide.
This following picture I took off one of the outermost and small Hawaiian Islands. More hair algae. OMG. Horrible.
Every healthy garden has some weeds. You pull what you can and call the rest "wildflowers."