Make sure you read the website I suggested. It has a lot of good information about keeping them.

The only experience I have with them is a couple of young ones I found while snorkeling quite a few years ago (1983?) when I was living in Indonesia. I tried to keep them alive but they got the white spot disease and died within a few weeks. And I was keeping them in the same water I found them in. This was pre-internet and it was probably 10 years before I learned about the white spot disease and what I did wrong.

They are neat snakes.
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Chris Harrison
San Antonio, Texas