Are you are talking about the compressed and dried stuff that comes in a brick? I've used it ever since I've had my first FBT. I peel off a thin layers and then hydrate it in hot water then use it as the top layer over my other substrates. I feel it keeps them from dragging the other substrate into the water.
I'm careful not to break it up into small pieces and keep it together so it's like a mat. It seems to stay in place very well. I've read the posts of those saying it's an impaction issue, but I tend to think they either used the loose sphagnum moss or broke up the kind I use.
I do have to change it several times a year as it tends to rot in areas where it stays very wet.





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