I got a baby String of Turtles plant a couple of months ago. Since the nursery pot was half split open, I transplanted the little guy to a slightly larger clay pot filled with succulent potting mixture, to which I added more perlite for better drainage. It's under a plant light, about 12 inches from the light, and I water it sparingly. It is sort of treading water, not dying but not growing lots of new leaves and getting bigger. I am worried about this little cutie. What can I do to make it happier?