Hm,
remember tokays are arboreal lizards. If they have the chance, they avoid to go to the ground at all. In your tank the animal has no choice but hiding in the cave on the ground.
This is extremely unatural and puts strong stress on the animal. You might not see signs of stress, but I guarantee, this animal is permanently heavily stressed.
Also the tank by far is not tall enough. A 1 ft arboral lizard should have the chance to climb vertically for at least 4 to 5 feet. And that is still a short distance relative to its size. Recommended mimimum height for a tokay tank should be 4 ft-which is well accepted in Europe but for some strange reason is not liked by many US keepers. The branches you have installed in your tank may be nice for your eye, but hey are of no use for the gecko. Tokays prefer to climb on surfaces exceeding their body diameter and avoid branches of small diameter if they do have the choice. Also they need some security and shelter to be confident not to be seen but be able to see everything themselves. Thus a tokay tank has to be heavily furnished with really thick branches and logs, needs a fake bark or rock backwall with vertical crevices large enough to hide in, rathe dense foliage and enough place to run around.
Your tank my be sufficient for a pair of pictus or sth. But it definitely is nothing I would keep a tokay in other than for quarantine.
Sorry for the strict words, but I am convinced you do want the best for your pets and just do not know better. There is so much inappropriate information on herp husbandry readily available that it might not be easy to select the reasionable stuff from all the crap.
Ingo