Dead Mollie ~ Was It An Inside Job?

Question
I have a 20 gallon tank just over half a year old, with the following fish:  two small bolivian rams (both ~ I believe ~ male, though they were sold to me as a "couple", one male dwarf gourami, a male and female gold dalmation lyretail mollie pair, three babies from these two (all of various colours and markings, about a month old), a synodontis catfish, a pleco and three dwarf underwater frogs (one of which looks pregnant . . .)  Today I noticed that my male mollie was missing, but I was on my way out so I assumed he was just hiding in the plants (our catfish keeps control of the cave.   When I came home tonight I found him lying on the rocks, with his insides hollowed out.  His skin was completely intact as was his spine which was hanging out of his body.  Did one of the other fish eat him?  Of all the fish I have, he's seems the most difficult to have preyed on ~ he was very showy, fast and tough, while the rest are rather slow and peaceful.  Should I be worried about the rest of my fish?  My suspicions say it was the catfish.  Should I find a new home for it?  Please help me uncover this mystery so I can save the rest of my fish!

Answer
This is tough to really tell what happened. But from what I'm reading, it seems your Molly might have died sometime over the night. The body could have been pulled into the cave by the cat fish and then picked on by other fish.  Usually tropical fish will not pick on eachother like that until the fish that is being eaten is already dead.  I don't think your catfish actually would have killed the mollie. Something else might have happened maybe a water level is off? or it was just stressed out for some reason.

The only catfish that I know of that are aggressive that are commonly sold are Spotted Pictus catfish.