Pond Boss Forums INTRO Questions & Observations red and green surface algae

May be early stages of cyanobacteria (bluegreen algae). If it is the colors will continue to turn into something that looks like spilled paint with green, red, brown and turquoise as best I remember from a couple of my outbreaks.

If it does change and progress like I describe it will also develop a bad smell and is not good for pets or humans to have contact with it.

I've not had it as bad this year as the last two years. I installed a more robust aeration pump with more air flow/water turn over and I am hoping that is what made the difference. Or it could be just a different year with different conditions.