I see you are on Caudata.org as well, so am I, I am Seth ( sde ).
Unfortunately this setup isn’t adequate for adults orjuveniles of this species. For adults is should be fully aquatic with lots oflive plants, with only a floating piece of cork bark, turtle dock, orsubstantial floating plant ( like water hyacinth or water lettuce ).
For juveniles, it should be either a terrestrial setup, or an“aquatic transition” setup, as I like to call it. In the latter you will needonly an inch or so of water, and lots of live plants. Slowly raise the waterlevel, the juveniles should become aquatic. I have a video on YouTube on how todo this.
For substrate on an aquatic setup pool filter or play sandis best, but you can also have a bare bottom tank (no substrate).
In the link provided in my last post, there is plenty ofgreat advice. That site in general has lots of great care info and advice.
If you have any further questions feel free to ask. -Seth