I think I will let it cycle out. Tank is doing great so far. I have seen growth with my torch. Tentacles are much more beefier.K. Well it's not going to kill anything.
You might want to pop the frag off and get it out if the tank and scrub it with a tooth brush. Usually I say just do it in the tank. But I have a. Similar red fuzz and it did spread a bit after tank scrubbing.
I use three containers with tank water. (So do it on a day after your water change) use one to scrub. Put a very little hydrogen peroxide in that one. Then use the other two containers to rinse.
The stuff I have spread , but then died after a while for no reason.
So really , you could leave it alone and enjoy some weird and let it cycle out of the system on its own
Or a gentle scrub and clean.
Hopefully keep going on this good road.