my bigger and much older cardinal tetra is bullying a much smaller cardinal tetra that i got last night by literally ramming into its body around the head area, especially on the eyes and it looks like it REALLY hurts, what do i do?

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Please correct me if i mispell a word.

<- That looks like a fish in a jar. Poor fishy. :(

They are shoaling/schooling fish. I have seen where singles get aggressive if not kept with a school.

I have not kept those specifically, but I have had problems like that with other fish behaving like that. Mostly large cichlids though. I have found that rearranging the tank cuts down on the aggressive behavior. Basically makes the established fish feel out of place rather than defending his turf from the new addition.

oh, and the older fish is a little lopsided, is that normal?

__________________
Please correct me if i mispell a word.

<- That looks like a fish in a jar. Poor fishy. :(