I've had good and bad success with moss. I first tried sheet moss in my first tank and it grew well, for about 3 months, then died off. In that tank I had usd jungle mix over gravel, right now that tank is a mess, I ripped out the moss, and have replaced some of it will pillow moss. I plan to redo that whole tank soon.
In my other three tanks I have pillow moss on just gravel. So far it is going great. I got some of it from the mossman and the latest from T&C. Both are great sources for moss. I plan to try some java moss, but have yet to do so. I would not say my pillow moss grows, but it doesn't die. In my azureus tank it has filled the gaps and still looks good for the most part, and it has been in there about 6 months. I did have a section die from getting too wet from my waterfall, that I replaced.
In my 10gal that has no frogs in it it has grow to about 3/4 of an inch high, and has killed off some of the lower moss. I plan to try some java moss in that tank and see what happens. Right now I’m just using it to keep some plants going.
I'm all for the gravel only setup, its easy and less messy, and I don't see my frogs covered in dirt. My Leuc tank is driving me nuts, and I need to pull the frogs out and redo it. Only thing abd about it is the weight. My 29gal azureus tank has over 100lbs of gravel in it. I might work on a false bottom setup with gravel ontop for my next tank.
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Kyle
1.2.0 D. leucomelas
0.0.2 D. azureus
1.0.1 D. imitators