Sump repair

Get weld-on #4 to wick into the crack, and it will solvent bond acrylic. And use weld-on #16 if crack is big, but yours look like #4 is thin enough to get into the crack and seal. And add a piece of acrylic rod on the inside with the same weldon to add more strength. Sound be good as new after that. Super easy.
 

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HOW IMPORTANT ARE FISH TO MAKING A REEF TANK FEEL COMPLETE?

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