herman:Here is their web site, an email to them would get you the answer.
For what it's worth, I really don't see the need for large tanks on Curacao with the possible exception of a few sites. Most of the diving is fairly shallow-30-50 ft so an 80 will last a long time.
http://www.the-dive-bus.com/
I totally agree and many sites have plenty to see at 15-20 feet. As a result, my safety stop oftens ends up being 15 minutes long.