It all depends on the seals. If you want a peace of mind then you could reseal the inside. I’ve been told silicone has a pretty good life span and I’ve had tanks that were very old and still tight. Is the silicone peeling away at all. Fill it with water in the garage I’d say. I think a hexagon would be the only one I’d really worry about.
Have any pics?
I’m sure someone else Might have some better advice.
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