create a clickbait title, get a clickbait discussion. As always, discussions go on all sorts of tangents with no real resolution. What about YOUR tank? Don't really know for sure. Take all the guesses that came before me. However, I will impart upon you something I live my planted tank by.
"Think of light as a gas pedal of a car. The harder you press down on the gas pedal (the more light you have), the faster your car will go (the faster your plants will grow). However, the car will require more regular maintenance (your plants will require more maintenance, i.e. fertilizers, CO2, etc)."
Quoted from Darkblade's primer : https://www.plantedtank.net/forums/s...php?t=107303#2
The phrase has been rephrased. quoted. paraphrased. but it holds true.
Whatever ails your tank right now, be it fertilizers, co2, etc, the easiest solution is also the simplest solution right now, but probably one of the hardest to do because we're mentally blocked from doing it. You have no business going fast on a car that doesn't have all its cylinders humming or wheels balanced. So, I echo the posts earlier to reduce your lighting levels and/or amounts. A Satellite Plus Pro at 8 hours full intensity sounds like a little too much. Too much gas.
If you have algae at the level you're having within 5 days, cutting light levels can only help you. A plant in the darkness can't even die in 5 days or else how would we ship plants? Try it for the next 5 days. Something significant. Like half the lighting period or half the intensity.
What do you do if it makes a difference? Try to run at that reduced level for a while as you figure out all the other issues. Flow, co2 injection, saturation, everything mentioned before me. All good ideas in their way. Pick a method of fertilization and stick with it for a while. Shouldn't matter in the short term. Less light lets you run slower and buys you more time to think about your problems. Can't think about issues if you're scrubbing down a tank every 5 days.
Who am I? Probably a noone. I can't claim any famous publications or fancy award winning tanks. I can only claim that I'm some regular hobbyist that went through what you are going through many years ago. Ecoxotic E-60 (Current Satellite Plus Pro's predecessor) at full power for 8 hours. and before that some T5HO Coralifes at full power. Just trying all sorts of stuff but always algae farming. Finally got smart and cut that light down.
When you get things right, I promise, you CAN run high light to your hearts content without triggering significant amounts of algae. I now can push 2X
Satellite plus pros at their full power. But even then, I only do it for 4 hours and drop it to 30% or less for the rest of the time (the other 4 hours). You give plants that short burst and they can be happy enough. Back then, I was baffled myself when I saw tanks running lights way higher than me and not getting algae. To the point of disbelief. But you know what? At the time, my tank just wasn't running properly. Except, the hard part here is not knowing what the problem is. So what do you do when your car is acting weird on the highway and it doesn't match up with what you understand is wrong with it? You drive slow, pull off, stop and take a look. Either way, you let off the gas.
Good luck and I hope you find your way!