As JRman83 pointed out, any paintball tank will work as long as it is a CO2 tank. The Compressed Air tanks are more expensive so I don't think that will be a problem. I have my tanks filled at the local paintball place here.
I heard that paintball tanks have oils that can harm the fish.
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Really? Do you have a reliable source for the information? In all the years I've been doing this and been a member of the forum I have never heard anything like this. Not trying to refute you but I am highly skeptical. Consider all the folks using these systems not to mention the regulator manufacturers. You'd think if that was a real issue it would come up frequently.
Also doesn't make sense from a paintball standpoint either; when dealing with compressed gases you'd want nothing else going through the regulation equipment. Oil can diesel under pressure.