This isn't a flame but I'd think two tangs in a 48" tank would be plenty. If considering the lemon peel, keep in mind that it's probably the most notorious of them all for nipping. Numerous text examples are available. I don't know this because of experience, I took Tullock, Michael etc. for their word. Bob's success isn't long term yet (and believe me I wish you [Bob] the best luck) and is the exception rather than the rule.
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Troy
lusus naturae
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