This grew in the span of a little over a week.
First of all: long time lurker, First post.
I think it could be some sort of cyanobacteria (due to the strong swampy smell), but I've never seen in a reddish black form and forming long strands. is black Beard? it peels off very easily, and forms a jelly like clear layer over the plant leaves. I've tried Excel dosing and it's not responding. The best I've gotten it to budge was a week long black out: but it came right back.
Tank specs: 15 gal flauval flex
Stocking: 6 neon tetras, 2 glowlight tetras, 3 endlers, and 2 nerite snails.
Phosphate: 0.25 ppm
Nitrate: under 5 ppm
ammonia: 0 ppm
Receives 7 hours of light each day. it is next to a window, but the blinds are down most of the time.
I used to run Diy Co2 (yeast method) but cut it after it seemed to make it worst. I am expecting a better (the more stable citric acid method) Co2 generator in the mail soon. would that help?
At the moment I'm about to tear down the tank, replace most of the plants, replace some of the substate with aqua soil, and remove as much algae as possible.
Any suggestions to beat back this slimy menace?