I wrote a fairly long explaination of our experimentation in the tank some time ago, I don't like the search feature here but you are welcome to look.
WE were all enamored of John C. Lilly's work and decided to go in on a tank with the original intent of moving it from one place to another - that didn't last long, I ruined my back yard with epsom salts and 600 or so lbs of them gets expensive.
We did a number of chemicals always with a sitter, LSD and K were I suppose, my favorites - well, and also doing no drugs at all. WE tried piping music it but it had various levels of sucess.