There's nothing in a clean up crew I'm aware that will touch bryopsis. Things are hit or miss at best, so in all my Reefing years Bryopsis has been my Boogeyman [emoji52].
Fought it for for over 3 years, bought everything people even hinted that would eat it, treated the tank with High Kent Mag, Hydrogen Peroxide, short to no light periods until I gave up.
At best I had periods where it would almost go away and then come back. Eventually you get tired of tank treatments where you clearly see it killing ur most prized corals and start remembering how good and easy you had it before the Bryopsis.
Bryopsis is not an algae that's "Part of the Reefing process". It's an introduced invasive pest.
Fluconazole was the only thing that actually killed the bryopsis and had no affects what so ever on any corals, fish or inverts for me.
By the time I found out about it, I had already given up fighting with bryopsis and restarted my display tank.
I was able to successfully use it in my temporary set up which I had reintroduced bryopsis (when I tried to save some corals from the main tank).
I know of people around my Reefing community that has it in their system and knowingly sells frags to other reefers. A disgraceful action.
If your cleanup crew hasn't been touching any of it, that's unfortunately a sign. If it's hair algae, they will be all over it.
Good luck man. Rant over, sorry... this topic brings back memories