The rest of my plants are doing good. I have a 29 gallon tank with 36 watts which is like 1.2 wpg, but it's T5 lighting and I was told it was actually more like 1.5 or more. I don't know if that is correct or not. I just started dosing excel this week, along with other ferts. The pennywort is just floating on the top of the water, but it really doesn't grow at all. The rest of my plants are all growing fine though.