I am such a arse

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Healthy swordtails should work.I have kept swordtails with large veija on numerous occasions without issue.

Could it be that op's zonatus are on the smaller side and viewed them differently than larger vieja would have ?

Gotham is a mess by the way
 
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Could it be that op's zonatus are on the smaller side and viewed them differently than larger vieja would have ?

Gotham is a mess by the way

A small one could see them more as competition than just a small neighbor like a large one would
 
Maybe but I have grown them from fry to 12" plus with swordtails and never had an issue.

Jaws Gotham is still screwed.
 
lol ....and LFS mollys, guppys, tetras, danios, and platys.................and cichlids too. Corporate chain fish probably have about a 50% survival rate on a good day, sadly.


Do you have any carnivorous or predatory catfish in that same tank?
No catfish just the zonts and tetra
 
Have you tested your water to check all is well.
Often fish will change behaviour and hide if something has spiked in water parameters.
 
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