Hi. A reply from Tetra said that Plantamin was 100% safe for fish and shrimp and that many people have shrimp in planted tanks and to have a fert that was not comparable with shrimp would not be commercially viable. I suspect that all ferts have some copper as a trace element because all plants, fish and shrimp require a trace of copper. The biggest killer is medication, where copper is one of the main bacteria and parasite killers.
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