This algae keeps popping up in my tank! I also have some GHA, but this stuff keeps coming back! Been doing water changes to bring nutrients down as they were a bit high (still high but much better) nitrates are currently 15 phos is .14 (currently treating with reef flux so phos has gone up again, had gotten it to .08 before reef flux) before starting the reef flux I was doing weekly large water changes, scrubbing everything, manually removing but it just keeps coming back! Not sure on ID so don’t know what else to do!