Tom...How is it that the glosso does not have one speck of algae on the leaves?? Is it flow, CO2 or what is it? It does not matter what I do to my tank, how much filtration I have, what I dose, etc but I always get this brown, green, black crap on my anubius nana petite leaves or any leaves for that matter. Have you ever fought this battle?
Sometimes I have in the past if I did not do something correctly.
Generally not enough care, enough CO2/ferts, too much light at that point in time.
This tank had GDA algae bad for about 2 weeks, but as you can see, no issues now. That grow in phase is critical and once you get past that, then you get nice growth like this.
I'll trim this rug to to the bone like I do in my 120 Gallon example when I had gloss in there. I showed how to trim it and then took pics of the recovery, then the next post trim and recovery again. You mow just like a lawn. The new growth is always nice, clean, small and tight.
Healthy happy plant leaves are the best defense against algae.