` Your Yellow Anaconda needs completely dry substrate. Newspaper is best, but no colored pages, just black and white. Use many layers, with the top layers wrinkled, with some wadded newspaper under the top layer, so the Anaconda can hide beneath the top layers, if it wants to. It should have floor heat, with a gradient from 73, to 88 degrees. You should not use an open top, or screen top cage, as it releases too much humidity.
` The entire floor should be heated, with a soaking container located over the part which is in the high 80s. If your cage is sealed properly, with vents only near the floor, the warm water will evaporate, and be trapped, to provide all the humidity you need for the Anaconda. The soaking container needs only to be large enough for the Anaconda to fit into. They like a tight fit, for security. They don't need to swim, they just like to soak. Even the soaking is optional. As long as they have enough humidity, and dry substrate, they can do without the soaking container. But they do like it, and I provide one. It needs to be easily removable, so you can keep it very clean. Otherwise, you'll have more problems. When they want to dry out, they need a completely dry floor to rest on. Having too much moisture on the floor, to provide humidity, can cause skin, lung, mouth, and throat problems, as you have already discovered.
` The Anaconda doesn't care about decoration, or an environment that looks like the jungle.

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