oh sorry, temp is 74 degrees F. I haven't tested for copper yet I really don't know where copper or heavy metals would come from other than the rocks in the tank, but even then the dissociation of those ions in to the water would be rather small don't you think? I'll check tomorrow regardless better safe than sorry. Haven't added any excel or co2. The only things added to the water were the re-mineralizer and a way under sized dose of flourish comprehensive. Shrimp are young I bought them as juveniles , one female in there is saddled.