Plants are just melting away
So in my 30g I had a bunch of Amazon broadleaf plants that were doing great up until 3-4 weeks ago. They started to turn yellowish and started to melt away. I do my water changes every 2-3 weeks, no co2, I use Thrive for fert and my nitrates are at 10-20ppm.
I went from fully stocked to having almost nothing in my background now. The only other plants in there are some anubias and ferns. some ferns are starting to break apart. any ideas/suggestions?