I have had it about 2months now i think - i got it from Mark, and it hasnt grown 1cm yet and i dont know why? 60l tank 2.7wpg / 36w PC T5 pressurized CO2 - limeade drop checker fluval 205 (11x turnover - good circulation) 5ml TPN+ daily. JBL aquabasis capped with sand. Anybody have any reasons why? Thanks.