Hi Gerrit,
This species is really widespread in a variety of different habitats, which usually indicates that it is a generalist feeder, able to survive on a variety of prey. Some of their relatives are even known to scavenge bits of dead animals, so this species may also be able to do that. However, all that I can find on the diet of these animals indicates that they have a "very broad diet" that may include polychaetes and other molluscs. I have seen them kill and eat other snails, and a closely related species is known to feed on barnacles. They aren't equipped to eat algae or detritus, although carrion might be an option.
Hope that helps!
Cheers,
Don
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