I was under the impression that all Co2 tanks contained oil. Wether or
not Co2 tanks for paintball guns contain more, I don't know. That is
one of the sales pitches with the ADA mini Co2 kits, they don't have the
oil so that you don't get surface scum on your tanks. I think you see
that scum layer on planted tanks with Co2 and not with regular fresh
water tanks in general.
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