I put some in my FBT tank about 2 months ago and its still going strong and growing, and seems to be growing really well by the edge of the water. And all I have for substrate is cocofibre over top of rocks with screen inbetween, and I also have started using spring tails too since I have live stuff in there. My guys love it, and I really like the looks of it and it doesn't get dragged back into water. The amount of stuff I pull out of my filter when it comes time for cleaning is next to nothing now also, and im not unclogging it once a week anymore either. And nice setup by the way, I really like it. The way the land is off to side then wraps around the back to the other side to create the pond looking feature in the front is what I was trying to do with mine, but I ran out of rocks when doing the back and didn't have time to run out and get more so It didn't end up happening.