Why on earth would someone do something like that? The only motiviation I can think of are a competitor trying to take out a rival business or some kind of personal revenge. The guy is a very messed up individual any way you look at it.
I've also heard of recent cases of people dropping copper washers into tanks. But I reject the idea of the culprit being an overly competitive fish store owner. Anyone in the hobby would have more compassion, these jerks are obviously mentally ill.
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