That's the trouble with HC (hemainthus callitrichoides). It's very difficult when you have very little to work with. If your hairgrass is too thick/dense, it will look like the HC is running into a wall (of hairgrass). You can try thinning out the roots of the hairgrass right next to it so that the 2 plants will grow and blend into each other. You can also have some other short plant in between to provide some transition. Another way is to have a raised effect by planting HC on moss-covered rock/driftwood. The HC roots will cling onto the moss and eventually spread and drape over the rock/wood. I'm trying that out now and find that xmas moss works better as it grows flatter. Java moss will cover up the HC.
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