There is no such thing as a ternetzi. If you mean the yellow variant of pygocentrus nattereri..... but no, I dont own one. Hopefully I will own one of CHUDS soon though!
I have a couple yellow natts and although some may say they are mellow, that is not my experience. One of mine is the most dominant in the tank and more territorial than my cariba or piraya. My experience with the pygo species is that almost all aspects from aggressiveness to territorialism is an individual trait and not specific to a species.
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