Hazards of Keeping Freshwater Fish in a Container that was Used for Adipic Acid

I have an Intermediate Bulk Container (IBC) which is a large 3' x 3'x 3' plastic cube. The label on the container described it as storing **Adipic Acid**. 


Is it safe to use this container to grow plant life and harvest fish life for aquaponics? Or is there a possibility that this acid has leached into the plastic?


My quick research has shown that adipic acid is a mild skin irritant. 




[Adipic acid occurs naturally in beets and sugarcane](http://healthyeating.sfgate.com/foods-contain-adipic-acid-2051.html), common foods, so it is not likely to be very toxic to fish *if sufficiently diluted* by washing. As @DGS and @ghost state, normal cleaning of the container followed by adjusting the pH for the fish should be OK. If you need to use an electric in-tank heater, though, check that it is safe to use in a plastic container.


 1