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I see two options.

1. Cut out part of the top of the old black water tank to give you access to do a proper job. Since you don't use it, not need to seal the hole you cut watertight.

2. Put in a poly or bladder tank. I prefer the poly option. There are companies that sell literally hundreds of off-the-shelf poly tanks. Yes you would lose some capacity, but might be the best long-term option.
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