Loosing their tails!!! help!

Nitrobacter

I am really worried I have flesh eating bacteria in my tank. Two of my baby mollies developed huge lacerations on their tails-- so bad that I thought another fish took a bite out of them. I isolated them in hopes of saving them from feeding aggression. They have both been eating a lot and vigorously since I isolated them. Today, one of the baby sail fin mollies that I isolated lost his entire tail. See pictures for details.

Of course this tank has been throughly cycled, there is a filter, heater, these babies are progeny of two of the adult mollies still in the tank (20 gallon high). I do weekly 25% water changes. Is that not enough? please comment if I should be doing more for a 20 gallon high.

What do you guys think? Bacteria, or aggression from the adult mollies?
PS first photo is of the baby that hasn't lost its tail, but the laceration looks similar to the molly who did lose his tail.
 

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AggressiveAquatics

It looks like he’s missing part of his body? Is that right? If his body is being deteriorated then I don’t think you can come back from that unfortunately
 
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