need local HELP!

[Razorworm]

came home tonight to a pond in my fish room (no pun). My holding tank ( 75 gal trash can) for my water changing system sprung a leak.

I am looking for a container to hold 75-100 gallons of water. The catch is, it has to be less than 30'' wide. I think the reason the trash can failed is that it is not uniform in shape and thus flexed every time I filled it, causing it to eventually crack.

thanks