One of my water sprite plants has had its stalks and leaves turning brown and I'm not sure what is causing it. It is also only on some portions of it while in others, it is growing like crazy. I started to think it might be my clown pleco eating it but since it is also happening to the leaves I'm thinking it's something else. I can't see how the pleco could eat the green of the leaves but leave the actual leaves behind. Does anyone know what could do this?