Is there some sort of drainage basin beneath the soil? If not, I would highly recommend that you put one in. A drainage basin can be as simple as an inch or two of gravel. This will work to increase humidity, and keep the soil layer from getting waterlogged. Essentially, the theory is with dart tanks that if you continuosly have water going into the system via misting, and then coming out (through siphoning off excess water in the drainage layer) you should never need to tear the tank down if it is properly set up and maintained. On an incredibly simplifed level, the plants, and microbes help keep the system healthy, and with water regularly going in and out, the system maintains an equilibrium.
After putting in the drainage layer, you can get rid of that water dish. These frogs really don't need standing water, but the gravel drainage layer will serve the same purpose as the dish, and look much more natural. Simply have an area of the gravel layer exposed, and have the gravel shallower in this area. This will create a sort of pond which can be where the excess water (a half an inch or so is acceptable to leave in there) can be drained off, and will also result in a sort of pool.
On another note, I would recommend adding more plants. They will help give your frogs a sense of security, will look great, and will work to keep the system healthy. Without heavier plant cover, I would not be surprised if your frogs simply hide underneath that grapewood, and you will rarely see them. The heavier plant cover will give the frogs the security they prefer to venture out and forage in the tank. You will see them more, and therefore enjoy them more as well.
Just a few suggestions. Good luck.
Double J
