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”.
Attach a toothbrush to the base of your vacuum hose with rubber bands and scrub it off rocks and let the vacuum hose suck it up, that will make it easier for the clean up crew to polish it off.