putting a pacman in a tank with just water is not a good idea, simply because it becomes very time consuming to clean the water everyday, which should be done regarless of whether or not he poops in it everynight or if you have a filter. you should at least use moss if you are going to attempt this, but keep in mind they are burrowing frogs and are from a tropical region, which means they need to be kept warm, and putting a heat light or ceramic heat emmitter on a amphibian should be avoided whenever possible and you won't have enough water to use a aquarium water heater safely. The best bet is using forest bed or bed a beast as a substrate. you should put some gravel or laval rocks under the dirt, with a landscaping fabric or non-metal window screening between the dirt and the rocks to allow for drainage. a large water bowl should be provided, along with a light daily misting. the best advice i can give you is to research your pet before you buy so you know what your getting into. I personally would not recomend using a bare bottom water enclosure.
2.0.0 whites treefrogs
0.1.0 mexican leaf frog (P. dacnicolor)
1.0.0 golden treefrog
0.0.1 green treefrog
1.0.0 southern leapord frog
2.0.0 green frogs
0.0.1 bullfrog
1.0.1 smokey jungle frogs
2.0.0 pixie frogs
1.0.0 pac-man frog
3.0.2 fire-belly toads
0.0.1 yellow-belly toad
1.0.1 fire-belly newts
1.0.0 blue-spotted salamander
0.1.0 yellow spotted salamander
1.0.0 barred tiger salamander
1.1.0 blotched tiger salamander
1.0.0 eastern tiger salamander
1.0.0 gray tiger salamander
0.0.4 koi
0.0.1 fantail comet
0.1.0 green iguana
1.0.0 german shepard
1.0.0 quaker parrolette