Sorry you seem to have made up your mind but weldon 3 or 4 will be garbage. Find a local plastic shop get weldon 40. Do it all correct the first time. I know your in a situation with fish to worry about maybe see if you can find another setup to temporarily work like a plastic bin from Walmart. But do the tank correct and it will last a long time. Weldon 40 the chip. Weldon 40 the inside seam to make sure you strength it. That is the best way to repair it.
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