Thanks all, some points to ponder. We googled extensively, and whilst we couldn't find any evidence of metal tank ornaments, neither could we find any advice against it. Given that most sites see fit to warn against even the most obvious potential dangers (such as open tanks/cats, sanitized driftwood only etc.), we thought it was a bit odd.
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The most difficult thing is the decision to act, the rest is merely tenacity Amelia Earhart
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