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No such thing as dumb questions, only dumb answers. If the sump and baffles are acrylic, use IPS Weld-On #16. If one or the other is glass, use aquarium grade silicone. Acrylic cement actually melts the two parts together forming a chemical bond. Superglue will work for a short time, but water pressure may slightly bow out the sump walls or the baffle, causing the joints to fail eventually.
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