10-25-2011, 02:59 PM
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Believe it or not, male guppies can actually be quite aggressive, especially with anything that they see as either a potential competitor or mate.
If there doesn't seem to be any serious harm to either, then it may just require a bit of time for the rainbow shark to regain his strength before all is well again. Do make sure that you have ample hiding places for the both of them, as hiding spots always help ease aggression. If there is obvious signs of stress/damage on either of them, then you may have to consider removing one from the tank instead.