I have 1.1 western ribbon snake juveniles housed in a 20-gallon long, with a basking spot of 80 degrees and plenty of places to hide. See the pic below:
I've added a backdrop to the outside of the tank since this pic was taken, to give them a little more security. They've been taking fish just fine until tonight. Earlier today I put several fish in the water bowl and they went to town like they always do. Tonight though, I found a fresh fish stuck to a partially digested one on one of the plants in my viv. I did note that one of the fish still in the water dish had a bite mark on its tail but is still swimming around. Is it possible that they just got overzealous and literally bit off more than they could chew? These were appropriately sized feeders. They've actually tackled much larger fish before with no problems. I've never had a regurge issue with snakes; I'm really concerned. I'm not sure which of my two ribbons did it, and I don't know what to do from here!