[ShaneSmith]

Trust me, eco complete WILL grow the Hairgrass. I grow it in Flourite, much bigger than Eco complete. It does take about 2 weeks for me to start to notice new growth and a month until it grows "Full Speed."

I am not sure why it takes so long to start, but once it does it is a pretty good grower. I would compare to the growth speed of Elatine Triandra, or Blyxa Japonica.