The tank is ABS, and you can "weld" it with ABS cement. One way to do this is to clean the outside where the crack appears to be, with ABS primer. Than brush on ABS cement. Better yet At the hardware store where you will pick up the ABS primer and cement, get a roll of fiberglas dry wall tape. The tape should be self-adhesive, and you cut a piece about 2-3 inches longer than the crack. Stick it onto the tank after you have used the primer on the surface. Than just apply 5-6 coats of ABS adhesive over the tape till it is covered. You can apply a piece of clear plastic, like a piece of shopping bag over the patch and hold it in place with painter tape. Next morning you should have a nice weld.
I have done it with several things, the latest was a table saw with a plastic/ABS stand that had broken in two corners. I just added layer after layer of ABS cement and it is just fine. Does it look good? No but it works.
Good luck.
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