can you use nitros oxide tanks for co2

[spikehs]

thanks for the reply... where/how do i "hydrostaticly test" it? at a refill shop? would this info be available on the bottle? would it also say if its been coated on the inside? You shoulda seen the reaction when I asked him about the NOS tanks, they couldn't get over how i was hooking up nitros to my tank mwhaha a turbo charged reef !
Thanks.

Sean