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Hello all, I have a question for you; can 1 swordtail, 2 mollies (plain black mollies, scarlet swordtail) and one catfish kill and completely consume another, similarly sized swordtail in the span of a few hours?

Here's the background for that crazy question:
I don't know what will be relevant, so I'll give it all to you. I kept a 15 gallon tank with swordtails (4 scarlet swordtails and 1 catfish, to be exact) for nearly a year. I went on vacation recently and had a neighbor care for the fish. Unfortunately, while I was gone, my tank filter malfunctioned and by the time I got home, the ammonia buildup had killed off three of my beloved swordtails and left the last one in fairly bad condition. (Scrubber, the catfish, seemed to be unaffected. He was my first ever fish, and has been happily cleaning his first, small five gallon home, and after about 4 months, the newer 15 gal tank for nearly 14 months. I love that little guy!) I separated Scrubber and the remaining swordtail into the little, bare bottomed, 5 gal tank that I keep cycling for unexpected fry, emptied the 15 gal tank completely, and started a whole new cycle from scratch. Yesterday was the 21 day mark, and the test kits finally showed that the water was ammonia and nitrite free, so I put my swordtail and Scrubber back into the big aquarium. I then headed to the local breeder where I purchased the first batch of swordtails and got 2 female mollies, and another swordtail to help fill the aquarium a bit. After several hours of letting them adjust to the temperature, I released them into their new home. All seemed to be going well all day yesterday, and most of today, until just now. I feed the fish at night, right before bed, as part of my nighttime routine, but at feeding time tonight, no little hungry mouths came bobbing to the surface. Upon a very close examination, one of the swordtails is absolutely nowhere to be found. No body, no evidence that the fish miraculously jumped through the aquarium cover, just... nothing. Could the other fish have eaten him- completely? I mean, there isn't even any evidence of a skeleton.
 
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