Good points, I don't feel that the plants are growing fast enough. These two types are almost weeds here and generally grow very rapidly. Mine are slow and the leaves are staying small. This pothos is the type that gets quite large leaves once it has run up a tree, often over a foot in width. I have heard that it won't start producing large leaves until it reaches the top of whatever it is on but these leaves are very small. I do wonder if it is a lack of sunlight, this area only gets direct sun for a couple hours a day and only in the summer, the rest of the year it gets good light but no direct sun. I was hoping to give them some more nutrients and see if it made a difference. Due to the lack of direct sun, I don't have an algae problem in this pond. There isn't an easy way to soak the roots in a fertilizer solution so I thought about spraying it on the leaves but I don't want to burn them.