My snails are different from yours, with a very flat spiral, and I've never tried to deliberately feed them to imitator tads or any others. I usually just let the imitators do their own tad care, and this was just an incident I observed once when a snail got too close to the brome cup the tad was in. But if you were caring for the tads separately, it might be worth a trial, just to see what happens. I'd put the whole snail in so they could tackle it or ignore it, just see if they'll take it on. I imagine that if you crushed it, they might eat the meat, but I've never tried this, because I've never tried separating and raising imitator tads outside of the parental care.

A single observed incident doesn't make it a standard act. I've also observed one of my galactonotus inadvertently capturing a platy fish fry from the paludarium, while "fishing" for fruit flies that had fallen in the aquarium portion, from the bank. I never saw this again, although it may have occurred again when I wasn't looking. One cannot therefore say, that they utilize fish fry as prey.

I just give these observations out as single observations. I don't think any of them are conclusive enough to generalize from, but they may be things to experiment a bit more with.
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Patty
Pahsimeroi, Idaho

D. auratus blue, auratus Ancon Hill, galactonotus orange, galactonotus yellow, fantasticus, reticulatus, imitator, castaneoticus, azureus, pumilio Bastimentos. P. lugubris, vittatus, terribilis mint green, terribilis orange.