For Dannyul, my first question is why you are dosing Excel if you're using pressurized CO2. I have Starogyne repens in my aquarium and it's doing pretty well. I don't get fast growth, but it is growing and spreading. Well, as much as it can in my aquarium, I need to do some plant removal to create some more space for it. I have a 55 gallon with medium light (a 48" Marineland Double Bright and a 48" Current Satellite LED+) on for 10 hours a day, no CO2 and only occasional dry fert additions. It seems to be working for me so far for the last six or eight months.