If you can get yourself some of those zip sealing bags so you can blow air into it (so it is like a greenhouse), it would do much better. Change out the water with aged pond water every other day or daily because the decaying pad will muck up the bag water quickly. Also, instead of gravel use sand with a pinch of fertilizer or regular soil for the potted vivips. Another thing you might want to try is small pots with holes instead of the cups if you aren't having a lot of success. Good luck.