I've been struggling with GHA for months now and for whatever reason, after dosing Aquaforest Life Source a week for the past couple of weeks-- the GHA has been melting. I know it's something outcompeting the algae but that's my finding so far. I also run a refugium with red macro algae for months that seem to lose to the GHA until now. I bumped up my skimming now to keep nutrients within parameters as the melting GHA is going to throw the tank out of whack again.