Sounds like... Copperbands.
If you're lucky, sometimes they eat well for 3 weeks then roll up and die without a single mark on them. This from non-cyanide sources.
They're just a really tough fish to keep in general. TBH, I bet you less than 1 out of 5 survive under experienced care. The odds are even more dubious if you count the fish sold to inexperienced aquarists.
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This and that.
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