I've been looking for a good deal on a tank and wondering if this would fit the bill? They've been hydro'ed, albeit a couple of years ago I believe...
http://www.rlairgunsupply.com/compressors-pumps-and-tanks/a-used-scba-88cuft-4500psi/
EDIT: now that I look again I don't believe they are carbon fiber...not sure. But they are 4500 psi so.......
http://www.rlairgunsupply.com/compressors-pumps-and-tanks/a-used-scba-88cuft-4500psi/
EDIT: now that I look again I don't believe they are carbon fiber...not sure. But they are 4500 psi so.......