the two on the sides are actually 4 stems put together you may not see in the picture but the one on the left actually has a twist tie on it. Not sure if that could help at all, didn't even notice it until I put the plants in the tank.
@bettasareawesome, did you purchase any liquid fert?
To lower your PH, you can get a piece of driftwood. The piece will slowly and naturally lower the PH level.
As far as lighting, do not get a bulb with higher wattage. I have a 15W florescent bulb in my 5.5 gallon and it is perfect. How big is your tank? It is likely that you can use the very same bulb I have.