Pls advise on green spot algae

Green spot algae is popping up on my plants--covering leaves, etc. Before
I've only seen it on the tank glass and scraped it away.

Is there something I can do to get rid of the spots on my plants? Might I
have too much of some nutrient or trace element, etc. TIA.

Greg. Tong
San Francisco, CA, USA
gtong at sirius_com

"Every infinity is composed of only two halves."