Just my opinion, but I still think there is not enough water. With that small amount, your chemistry is going fluctuate from one extreme to the other. I'd imagine you'd have to change water daily. My FBT's like both shallow and deep water. I use a gallon of water in my 10 gallon viv. The entire bottom of the viv is wet. I use gravel piled up to just above the water line for my land areas and then top that with substrate for my plants. The plus on that is the plants can sink their roots to the water and I don't have to fuss with them. I generally change the water weekly, but even when it's been over 11 days, my ammonia and other stats are still within safe limits.

Take a look at the pics this user posted....... http://www.frogforum.net/showthread.php?t=34637 That's a fine setup IMO. You can see how they piled up the gravel then added the land above the water line. Your viv look like an exxoterra and they are able to support a wet bottom.