Just an FYI and I don't know if this applies to your tank but about 20 years ago I had a client that had what "seems" to be the same size tank, 6' long oceanic bowfront. It was replaced under warrenty when the blcak silicone started to change color to a brownish orange in spots. (I've always figured the price of a new tank versus using an old tank was worth the peace of mind.)
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"Our crystal clear aquaria come nowhere close to the nutrient loads that swirl around natural reefs" Charles Delbeek
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