Nice setup.. but i dont understand why would you want to do a DSM with hairgrass and java moss..with HC i understand because it doesnt root well and is a tough plant to grow..
I am sure with the current setup flooded from day1 and pressurised CO2, you would have had almost a carpet..
This is the growth I had in 3.5 weeks starting from a few strands of dwarfhairgrass, co2 at 1/3 bps:
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