Hi, I am very new to planting hairgrass as well, don't mind if I share what worked for me. YMMV.
What I did was to bunch them up like 3-5 plantlets per bunch and use the metal tweezer to grab the entire bunch. I will the shove the bunch really deep into the gravel and slowly ease the tweezer out. The bunch is almost half buried in the gravel.
So far the hairgrass declare war on the other plants and invaded 100% of the real estate except the areas I barricaded with driftwood and moss balls. Soon they will be climbing over the driftwood and try to sneak into the safe zone.
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