I wish Id been told differently about handling algae or any other pest invader. Id tell the 24 yr old me this:
-there is no rule in reefing that says you must not take direct action against an invader. the common rule is to take only indirect action, through the tank water, but thats not the only way. You do not have to submit fifty different threads on ID, hope to hades that the authors on various forums will answer you with a secret nobody told you about what to do to your tank to rid yourself of the invader in question. You can simply remove it through one of many ways. you have the option of 1. looking at a growth on your rocks that looks to be questionable, or certainly bad like hair algae, then 2. make that spot not there any longer.
most reefkeepers who seek help with wrecked tanks are using intended preventative systems like gfo as the removal system for a primary invader, instead of making the tank free of algae by hand first and then using the preventative correctly. we find that overcompensating for die off time, by using more gfo, still takes a long time to remove what you could remove in a few hours work and bleaching of unintended targets is a real possibility.
we are told not to use bandaid approaches, while we are being told to use unnatural binders like gfo which are still bandaids because they have to be replenished repeatedly the same as any other algae care method. the only natural option not a bandaid is grazing, and if that doesnt work we've been trained to sit idly by and let the tank get taken over. Im glad I stopped listening to common advice my tank never looked better.
so, 24 yr old me, if an all natural approach is all you will allow, then you have about a 20% chance of everything working out. that method works sometimes, the hands off approach. if it worked more than 20% of the time we wouldn't have so many wrecked tanks. If you simply disallow anything in your tank you dont want, you have a 100% chance of it working out, make the choice, play the game as you see fit.
the ocean has better water params than we ever will, yet the reefs grow algae that must be balanced by fish and other grazers. the cause of all algae wrecked tanks isnt phosphate, its simply inaction on the part of the keeper, a totally deserved and predictable outcome. Nobodys tank transformed into a green forest overnite, it was a series of inactivities after the first time a tiny tuft was noticed and not dealt with.