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@Crabby48 check this out.Vs animals, waiting to see if they work while mass builds, consider peroxide. Ulva is highly sensitive to peroxide it's nearly a guaranteed cure.
Lift out a rock with ulva on it, set on the counter in air. Corals aren't harmed a few mins in air, I have a video of me draining my whole nano with 13 yrs of corals for 30 mins, yours is a few mins.
Pour peroxide on target, avoiding corals, wet the target creatively
Let sit two mins cooking
Rinse area w saltwater, leave algae in place, set rock back
Compare that treated section to anything else you do, if it's the best section after a week, do it all. This method contacts peroxide only to the target, its coral safe and predicted best cure.
Ulva is requisite hitchhiker, when killed off, cannot come back.