Can you get decompression sickness from a tank?

Usually from diving: It is the body's response to reduction of pressure without equilibration. Usually associated with too rapid ascent from depth, it is also called caisson's disease because of the air pressure necessary to keep water excluded in contruction (e.g., deep bridge abuttments). If the pressure high and suddenly reduced, yes.

Maybe: From a pressurized wet tank - but the people operating the tank pressures would have to be really screwing it up - for this to occur. I should note - I am not talking about the tall wet tanks that are used to teach underwater welding or diving. I guess if you were underwater long enough - it could occur w one of these.