Sure, take the water out and put a good screen on top so they don't slither out. I use to raise tropical fish and one day I bought a Knife Fish. They look like a snake or eel. One day I came home from work and it was gone. It must have slithered out of the top and crawled or slithered into a corner of the room, under a recliner. I found it all dried and shriveled up. At least I finally figured out what happened to it.
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A lot of people do, they don't even need to hold water. much is getting a secure top for the aquarium.
I have kept rodents, lizards ,and snakes in such. the oldest girl,her hermit crabs.
Substrate or bedding in place of water.
Sure, take the water out and put a good screen on top so they don't slither out. I use to raise tropical fish and one day I bought a Knife Fish. They look like a snake or eel. One day I came home from work and it was gone. It must have slithered out of the top and crawled or slithered into a corner of the room, under a recliner. I found it all dried and shriveled up. At least I finally figured out what happened to it.