I've seen a few threads here and there with pictures of "mature" BH media compared to new, but none where the media was heavy with mulm or overly thick biofilm. It would be interesting to see mature media from a warm climate where it is in service 24/7/365 with examples from each successive tray for comparison of film thickness and bacteria subspecies from each tray. One would expect differing colonies from top to bottom as the digestive process goes from ammonia conversion in the top tray to nitrate conversion in the bottom.
It also makes me wonder if simply rotating the media from bottom to top would accomplish the cleaning process over time, but it would be a lot of work and a multi-year project to see... Probably a lot simpler just to ask Momo what they do
. Whatever it is seems to work for them
