A lot of fish food has some copper in it, the Fluval Bug Bites that I feed contains Copper Sulfate, and the Wardley Shrimp Pellets that I have for my cory cats has both Copper Proteinate and Copper Sulfate. So far my snail population is surviving just fine.
Ahhhh yikes I have wardley algae wafers that have 2 kinds of copper in it too! Thanks for letting me know! I randomly ordered food without checking and surprisingly the ones I ordered didn't have copper. My snail population doesn't care nor my betta I don't think (or maybe that's why my last 2 bettas lived under a year?) but I did have a couple shrimp deaths. And I have a berried female I'm trying to keep as comfortable as possible and copper definitely isn't apart of that lol
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