i'm having a little problem here. i have some ludwigia repens and a wendtii red in one of my tanks. the wendtii is doing fairly well, but the ludwigia is not doing to well. part of the problem is that my plec insists on pulling them out every night, so i find the stalks floating in the tank in the morning. is there a way to keep this from happening? i like the plant, but this is a pain!