and to me this sets the stage for all algae you will ever have even though this isn't algae. If you google problem algae tanks, they all have 1 factor in common and then vary greatly after this initial shared factor:
Whatever took over their tank was left in there and allowed to add mass.
Various algae kill vs removal modes will certainly alter your overall work/repeating, but in the end simply allowance is what causes all algae problems, not nutrients and not tank age. Its true low nutrients can control algae issues, but in counting the number of tanks that were already deploying fine po4 and no3 levels before the invasion, we can see that simple farming is the root cause. All other nuances are modes of prevention, but whether or not X makes your tank looks bad will always be countered by the option of doing more work to disallow X. anything that takes over a tank can be removed initially while the mass is small, or waited until later when its a big job. how often you repeat this is determined by the collective designs for your tank and other variables.
we all have final instant say over algae problems, independent of nutrients, fine trick to know there. we must have corrected five thousand tanks by now using that mode in the bottom thread in my signature, about the challenge tanks. to me, a new tank isn't about letting various things come and go, its about doing lots of work to guide your substrate into compliance initially, then easing back off over time as maturity takes over within the system to continue. Your tank is giving you the first of thousands of cleaning hints.
B