Got it. I caught it overflowing with bubbles and reduced it I'm gonna already have to empty it?!! What does this mean!?Cup is full.
Green means it's pulling algae out of the water, which you have a lot of.
Pull the cup off and dump it out.
See the rubber gasket there?
That keeps the cup where you put it so when you move it set the band there.
Start with the cup as high as you can but not so high that water runs out the bottom.
If you need to turn it off, do it.