I have a 9 inch plecostamus that loves the stuff.

It only seems to grow on one plastic plant, which I debate removing, but he
loves it. (Eating it right now)

Aside from physical removal I don't know any easy treatment.

Florida Flag fish sometime develop a taste for it.

I use Java Moss to remove nutrients from the water. I don't often have
treouble with any algae one I add Java Moss