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what i would do if you cant get a new sump, is take a piece of acrylic and make it so that it is 4 or 5" bigger on all sides or even copy the side of the tank and seal it on the outside of the sump.. make sure the sealant is around the crack and then seal the rest of the edges.
Not acrylic it's glass I got to it early and sealed it up. There's not much pressure there and I put silicon on both sides and let it cure last night. Holding water now I'll keep an eye on it till I can get another tank.