I had an outbreak after uprooting a huge mass of plants and what worked for me was a diatom filter, or more exactly a HOT Magnum with the micron cartridge and DE. I ran it for a couple of ours per day over a couple of days and the greenwater was and is gone.
I'm not sure Excel will directly affect it. It will however help your plants if your CO2 is lacking a bit. You'll still need to address the cause of the greenwater. Make sure your CO2 and ferts are optimal for the amount of light you're using and keep in mind the more light you have the finer line you walk between algae and no algae.
I'm not sure Excel will directly affect it. It will however help your plants if your CO2 is lacking a bit. You'll still need to address the cause of the greenwater. Make sure your CO2 and ferts are optimal for the amount of light you're using and keep in mind the more light you have the finer line you walk between algae and no algae.