Different flavor of algae

[WeehawkenFish]

Hey all.  Several months ago this forum helped me with my algae troubles.  After lowering my light (fluval screenshot attached)  my algae was much more under control.  But now a few months later it appears I'm dealing with a different looking algae.  It's black, and you can see it on the surfaces of the plants as well as the substrate.  It's really covered the anubias and water sprite.  Any suggestions?  Could there still be too much light?  It doesn't look appealing and I feel like it's hindering the plant growth. 

 

Bonus question:  One of the images is of my crypt.  It has grown great (tall) in the 5-ish months I've had it, but I've noticed it has thinned out and is not as bushy.  Any idea why?  More root tabs?

 

 

 

[Fish Folk]

I've found this Algae Guide from Green Aqua to be very clear and helpful: https://greenaqua.hu/en/alga-tajekoztato

But what you're seeing is sometimes breakdown from plants that are not getting proper nutrition. The leaves turn brown, but it may not be algae. I find the attached diagram helpful.

[WeehawkenFish]

Thanks @Fish Folk.  That diagram is helpful, but don't you think since the same stuff is on the substrate, it would suggest that it is algae?

[Fish Folk]

3 hours ago, WeehawkenFish said:

Thanks @Fish Folk.  That diagram is helpful, but don't you think since the same stuff is on the substrate, it would suggest that it is algae?

Probably, yes! I’m not great at Algae I. D.