I have a 90g that the live rock came from a badly managed tank. The tank was full of hair algae, the water was very cloudy, almost to where you could not see anything in the tank. When the rocks were moved, the water turned brown, looking like coffee.
For a few years after put in use, this tank has always had algae issues, until I launched an ATS in 2014. I did not have hair algae since then, but the ATS is small, and able to keep the HA away, but I still get surface algae on the back wall, overflow box, etc. The waterline also gets a muddy feeling film, almost sludge like.
I used this Vibrant product one week, and it knocked out all of this. I had placed my ATS screen in the sump of my 150g so it would not be affected. It was very impressed how well it worked. I put my ATS back to work, and now the tank looks better than ever.