If they used a rubber sealant it wasn’t done even close to right. It will need to be taken completely apart and absolutely every bit of the rubber sealant must be removed. I’d actually recut the pieces edges to be absolutely sure it was gone and sand the flat parts where the edges will be welded to a bit. Then you need to weld it using the pin method using weld 3 or weld 4 clamping it lightly wnen you remove the pins. Acrylic and rubber or silicone just don’t mix..
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curfent tank is a 120”x38.5”x29” 560 gallon acrylic fowlr
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