Pfft, Velvet sometimes just happens spontaneously. I've seen it in maintenance tanks that haven't had any new additions for months. I have suspicions that it can either lay dormant for extended periods or can be introduced via food. I've also noticed that a big velvet infestation can cause extreme distress to corals. Perhaps velvet is a key vector in total system (not just fish) wipeouts?
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This and that.
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