Each of these fish is an invidual and it's going to have its own personality. Some are going to kill clam, shrimp etc....some are going to be model citizen.
I have a niger for a year and half and it is a model citizen. Does not touch my clams, shrimp etc...but it is always a gamble when you buy one of these.
It is best to buy it small and keep it very well fed. If they are fed like little pig they won't go hunt for food on their own. I suspect that biting fish and eating shrimp or clam is because they are too hungry.
I feed mine morning and evening and each time he eats like a pig. He's now nearly 8" with the tail.
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More fish die from human stupidity than any other disease...
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