There is a form of moss... I don't know the latin name for it, but it's called mini moss here. It looks exactly like christmas moss, only, roughly, half the size.
I think you have your substrate a little too flat... Maybe if you sloped it off to the sides and create a little "valley" in between? You could fill up the valley with the HC and have the HG growing on the 2 "hills"... I hope you can get an idea of what I'm trying to describe...
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