hey i grabbed a pot of hairgrass a few months ago and it hasn't really done anything in my tank.i probaby mishandled it when i planted it, i tried to get all the stone wool off of it and pulled it apart into smaller clumps kind of but i didn't think i broke it too much. my tank is soil base layer with an inch and a half of sand on top and had diy co2 into it for the last month or two and recently started dosing with flourish comprehensive. my light is only 1w per gallon, so i'm wondering if that is even the reason. it stays alive pretty well, it's nice and green it just doesn't really grow, there is virtually no root growth as far as i can tell. everything else seems to do alright. is it the low light?