Finally got some tolerable pics of them :
One with nice fins:
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One with deformed fins:
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The source is two local breeders (I got the group of 6 in two batches, so I don't know if they're all from the same breeder or not).
Here's a few more pics:
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I would like to be sure these are actually S petricola and not some sort of crazy hybrid. Assuming I am correct that they are just inbred, I kind of have to wonder how much inbreeding it would take to get these kinds of deformities. All 6 fish eat and play and seem very happy - some of them just look a bit funny.