I'm not sure this is what you have, since it's hard to be sure with common names, but Scotch moss is another name for Selaginella brownii, which is a very nice club moss that grows more like a small fern than a pillow moss, so you may want a ground cover type moss as well. The best bromes in my view are the Neoregelias--smaller species. Some may have little barbs along the edges and it might be best to avoid these as they could prick the frogs. I have a few of the barbed ones in a leuc tank and haven't noticed any injuries, but you might want to be safe than sorry.
Another way to hold your pump away from clogging materials is to put it in a food-keeper dish sunk in the false bottom, as a kind of pool. You can puncture holes in this with a hot ice pick for water circulation, and hide the pump and edges of the dish by covering it with largish, smooth stones.
You can also build a false bottom using CocoTek Grow Slabs used for hydroponics. This can be easily pulled apart into thinner slabs for the sides and left thicker for the top that holds the substrate. Then you can put gravel between the glass and grow slabs to hide the false bottom "box." I've just used this for the first time on a new tank, and it's really simple to build and neat. It filters out all of the crud, so nothing gets to your pump to clog it. You can cut out and line pools wherever you want them.
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Patty
Pahsimeroi, Idaho
4 D. auratus blue
5 D. galactonotus pumpkin orange splash back
5 D. imitator
6 D. leucomelas
4 D. pumilio Bastimentos
4 D. fantasticus
4 P. terribilis
4 D. reticulatus
4 D. castaneoticus