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I'm not sure where I read it but, the statement I read said that they tend to pick on the smallest, or weakest in a school. At one point I had 13, now only 2.
The only thing I had trouble with recently was that I tried to replace those that I lost, and they died over night getting stuck to the power heads I had in the tank. Now, no more regular power heads, now I have Koralias.
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