Help emergency 4 dead in a week

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Dyood

Aquarium Advice Apprentice
Joined
Jan 3, 2020
Messages
22
I have noticed on all 4 fish they have had their fins bitten off but I can't figure out which fish it is I lost a female betta, a blue eyed yellow rainbow, a black cory and a female swordtail.

The other fish I have in my tank are,
1 male swordtail*
4 females and a load of fry*
1 male platy*
2 female platy
2 blue eyed yellow rainbow*
1 celebes rainbow*
2 dwarf neon rainbow
1 panda cory*
2 peppered cory*
2 bronze cory
1 black cory*
1 gold cory*

I know they all work together, I know some should have more but these fish have been rescued and taken from friends and family who could have them anymore,

I have majority of them for 6 months except and black and gold cory for 2 months*

Please any ideas on who is the aggressive one and killing off my fish.

Could this also be a reason why my platys arnt breeding
 
Ratty tails could also be rot from poor water quality. What is the size and water parameters of the tank? (Ammonia/ nitrite/ nitrate)
 
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