It's not just this subforum, it's the entire forum, and other forums as well. Somewhere in the past 5 years, they started to die (again, like others have said, due to youtube, reddit, whatever). I've had to migrate from one reefing forum to another due to a lack of activity in addition to toxicity from the former. And MFK (monsterfishkeepers) is greatly weakened as well.
I typically jump on the general discussion, fish, and shrimp forums since those are what I'm good at. It used to be that throughout a day, I'd be able to see new threads/post within 24 hours that would take up an entire page. Now I'm lucky to see 2-3 new threads/day.
For some reason, Reef2Reef is somehow thriving (I can typically see a new page of unread threads in a random forum within 24-48 hours). There've been talks of them expanding to freshwater, but always dial it back because that would need a name change. It'd be great if somebody could start something like R2R but freshwater oriented...
It's sad, but at least the information is still here. And hopefully people on Youtube/whatever who are willing to provide quality content that isn't riddled full of mistakes (you know exactly what unethical fishtubers I'm talking about).
So many fish/plants/inverts to keep, not enough aquaria.