[Sounguru]

Were these wild caught or tank raised....?

I investigating these these further I am finding most case happen right after introduction and are wild caught snails. It means that they have gone for a long long period of time without being fed. Shrimp are native to their range so it makes sense that they would be on the menu, but tank raised are usually fed on a regular basis and are used to snails being easier prey, and more common than shrimp. I doubt that this will be an ongoing thing once they settle in. I have several tanks with 200+ shrimp and large amounts of assassins all tank raised with no shrimp kills.

Also pond/bladder snails are not high on the menu choices for assassins they prefer Ramshorns and MTS style snails. They will take the ponds/bladders down but usually when all other snails of eating size are gone or when they happen to just stumble on one and it is an easy catch. Bladders/ponds can both outrun an assassin.