Hey fireindc or is it Fire In Dc, thats how I remember your name.lol.
First of all it's pacman, not packman, but I believe that was a typo and I'm sorry for bringing it up. Pacmans, which I have previous experiences with, grow to be about 8", males are usually smaller than females, slightly aggressive and can bite with the two small tooth located right above the front part of their jaw, which is used to contain the prey item, shouldn't be kept with anything thats smaller, can drown in deep water, 78-84F is great, higher humidity or else they'll spend time in the water dish instead, UTHs are better used as they dont dry the frog as lights do. The last person that posted said don't feed them fish, but you should. It gives it different varieties of vitamins even if it doesn't obtain much nutrients from it. Large pacman can eat mice. Gut load the insects. I've also read some can live 7-10 years, I only had mines for 3. 2 or so inches of soil is great as they are terrestrial, a small dish of water, and some plants is great. 10 gallon is good enough, 20 is better like the other guy said but is not neccessary as they aren't active to require that much space. Good luck.