1. Make sure you are using dechlorinated water. You had mentioned previously that you thought your frog was showing signs of toxing out. Using non-treated water is the most common cause of that.

2. 100 watts is much too high. You shouldn't go above 50. The heat and light can damage your frog's skin and eyes. The high wattage will also burn off the humidity much faster. Another way way to keep the humidity up is to cover approximately 2/3 of the vented area with a damp towel or something similar.

3. Sometimes such a large tank can be overwhelming for a small, young frog. Not necessarily, it varies by frog. It helps to have a few plants to shade them and for them to hide under. Your pictures are too dark to tell if you have that. Also, covering the back and sides of the tank can limit visual distraction and make the frog feel more secure.

4. Stick with a small water bowl for now. Pacmans are not the best swimmers. The water should not go above their nose when they are sitting in the water.

Best of luck. Take care of the little guy/girl!