In my case it's been there for months, but the plants are growing pretty well though, and algae is otherwise not too bad (apart from a few diatoms).
Silicates are also a factor to GSA I think?
So, water changes could keep introducing silicates?
6' Planted Tank (72" x 18" x 20") - 4 x 30W T8 Tri-Phosphors - 2 x Eheim 2217 'Classic' canisters
Flourite substrate - Ocean Runner OR-2500 + AM1000 - Tunze Turbelle Nanostream 6045
6.8kg Catalina CO2 - Red Sea Pro regulator - Swagelok B-SS4-A metering valve - Vecton 600 UV