What algae is this and how do I KILL IT

[sns26]

This is in my main tank and, for scale, that is a small anubias leaf.

It got started under high light and fertz. Since then I backed off the light and the fertz. Its growth has slowed but I can't seem to get rid of the existing stuff--it isn't growing on new plant growth, but it is pretty tenacious on the old growth.

Will excel kill the stuff?

[SCMurphy]

Remove all the leaves that have it. You can try an experiment on some of it outside of your tank. I'd try excel in one cup and H2O2 in a second cup and see which one does a better job.

[jweis]

I have it too. Amamo shrimp will eat it if you put enough of them in the tank. I have gotten it out of one tank, but it stubbornly stays in the other tank. It likes to get in the bolbitis. Im at the point where i am considering tearing down the tank.

[sns26]

For what it's worth, I seem to have dealt with most of the issues by turning off the fertilizers. That means my hairgrass is moribund but I think it's a fair trade given how much I've been traveling.

[alpha1172]

staghorn, typically due to high organics/dirty tank , ammonia increase. Clean tank, remove what you can , spot treat with H202 or excel.