Good call! Definitely green under a strong white light led flashlightDoes it look more green if you shine a flashlight on it(regular "white" light vs. Red)? Also appears to have cyano growing on/in it. Mine looks alot like yours and has been healthy/ growing for about 8 years, never dying off. And it is a nice deep green viewed with flashlight
Re: cyano....knock on wood I've never had a cyano outbreak....there has been a few times I jmhave thought I've seen it growing between rocks but it never manifested to anything