I’ve had some hair algae that I haven’t been able to get rid of, my cleanup crew seems to be leaving the longer stuff alone - would a lawnmower blenny eat it and a good addition for 30g?
You can always “rent” sea hares. They are great when algae gets too long and too much of a problem. The downside is once you are out of algae, you’ll need to rehome it. Hence the “renting”.