cracked

Picked up an empty tenner cheap secondhand, but just as I was at checkout accidentally banged the corner on the counter. So had to buy, damaged it myself right in front of the clerk. I have silicone sealant but have only used it to make a lid hinge, and to patch a cracked intake pipe, neither of which are as crucial as a corner seam. Am asking on the forums how salvagable this is now.

(I intended to use the tank for my QT and ditch the plastic tubs - it's too dim to see thru the sides and not quite enough volume for easing dosing meds, etc.)