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yes it goes back to normal if i empty the tank or push it really hard, I got it from a friend who had it in storage for a couple months, I'm not sure about the brand either it has no marking sverification, but I guess no use risking it.Pardon me as I don't have much experience specifically in this manner - but it does look like it has some separation? If you run your finger along the seam's and move the air bubbles away - does it look better or worse? The tank looks relatively clean - is it new and who is the manufacturer?
Lastly, my rule of thumb here is "Why risk it?"