Many thanks!
I grew the umbrella plant from cuttings off of a larger parent plant. Once they had established roots,I tucked the end into natural holes in the lace rock , and filled in the empty spots with substrate. then i tied them down with fishing line to give the roots time to grow onto the rock.
I also tucked in some pillow moss around the bases of the plants. Only time will tell how well they do in the long run.so far they are growing well and putting out lots of new leaves and roots.
That's a very nice tank joshBA.
Cheers