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There are several types of green algae commonly found in the hobby. A little more info is needed... Can you easily pull this off the rocks? Do the individual pieces look branching? Depending on the type of algae it is, different methods of removal are used. What type of clean up crew do you already have?What is the green algae and what eats it please?
How big is your tank?It doesn’t come off easily at all! I have blue leg and other hermits, astrea snails, baby pencil urchin, nothing eats it!
^^ THISIf it's hard to pull of the rocks, it's either bryopsis or green turf algae. Either one is incredibly difficult to remove using normal methods. The only things that will eat either one are urchins and crabs.
Make sure your cleanup crew is appropriate for your tank size (half of what reefcleaners recommends is a good long term amount, what they recommend is okay short term to help with problems).
This algae I would treat with fluconazole (reef flux). Throw a bag of gfo/phosban as well as something to help keep nitrates in check like purogen or NoPox dosing. Add enough reef flux to your main tank to exceed the directions (round up to the nearest capsule) and also in your saltwater storage barrel. Turn off skimmer the first week. Do 10-25% weekly water changes with this water until you see the algae dissappear. Once it's gone resume normal 10% weekly water changes with no reef flux.
I used this procedure plus restocking my cleanup crew to go from a tank with 8 times as much algae as yours to completely algae free (except weekly cleanings of film algae on glass) and 2 nitrates 0.02 phosphates in 6 weeks. Bryopsis gone in 2, all other algae gone in 4, nutrients under control in 6. Though to be fair, my tank was 7 years old and I wasn't overfeeding. My problem was 100% just a bryopsis infestation I let go out of control when my son was born.