Sounds like cyano bacteria/aka red slime. It is generally from your phosphate being high or phosphate directly from the gha dying. I recommend manually removing the gha so as to not release all the nutrients back in the water.
The Gfo removes phosphate but may not be able to keep up with the dying gha. Might also consider phosphate e if you get more red slime. I look at algae and cyano type bacteria as suspended nutrients, if it dies it is going back into the water. Red slime can damage coralline and many coral. That being said I have also had red slime appear when my gha was dying or a coral
What he said, by pulling the hair, you save the step of letting it die, and then having to skim the nutrients or remove them by water changes, you will still have to do the two, but it will speed up getting rid of the hair for good
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