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penguin tetras being aggressive
hey there, i just put 4 new head and tail light tetras into my 30 gallon tank. i originally had 3 head and tail light tetras and 4 penguin tetras and everything was fine, until now. the penguins are going mad and chasing all the new fish around and acting really aggressively. i remember reading that they where supposed to be peaceful fish! has anyone else seen this sort of behavior?
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