Yes, tigers can attack each other and harass each other to death. Mine will pick on anyone in the pack that is weaker or slower (or smaller) than the rest.
What it also could be, however, was a mini-cycle. Adding too many fish at once will kick even a cycled tank into a mini-cycle, especially if it was cycled with fish, because there isn't enough bacteria to handle a large addition to the bioload.
Any idea what your water parameters are? Are those the only livestock in the tank?
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Tina
Puffers:
Auriglobus silus x2
Colomesus asellus x1
Tetraodon travancoricus x1
Tetraodon biocellatus x2
Tetraodon nigroviridis x1
Tetraodon baileyi x2
Tetraodon lineatus x1
Tetraodon palembangensis x1
The greatness of a nation and its moral progress can be judged by the way in which its animals are treated. - Mohandas Gandhi
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