Oh, I get it now, nice tank! Fuzzy brown roots can be normal for java fern; fuzzy grayish is more apt to be BBA, not in a scary way...but if it's only on the roots it may not spread much if at all. There are many kinds of ferns & mosses I haven't kept but no fake moss for me yet, lol.
3 or 4? of your ferns look like "narrow" & nicely healthy & happy...Although that longest leaf of your last front dead center plant may be heading toward a bit of trouble in an old leaf way.
What is that java fern in the left to middle up high? I think I may have had that 1...Trident (left)? & maybe "needle?" in the middle? I've had many different 1s thanks to my plant club, a bunch of very generous & interesting people.
There might be a fun plant or fish club near you. Do you live near a bigger city? I've lived on both coasts where there are both but there are some in the "middle" US & other countries too. If you tell us in a vague way where you live we may be able to help you find 1. Even if you don't go often it can be a fun road trip with probably new restaurants etc nearby or on the way.
Another plant to think about in a low tech way in anubias. It attaches to wood or rock like java ferns. But a nice dark green & comes in several leaf shapes. Another are cryptocorynes planted in the substrate, many species & varieties, they're mostly not fussy about light & like a root tab sometimes.