Amano and Cherry Shrimp Dying

[Jmedulla12]

I got a few amano and cherry shrimp last week. They were doing great the first couple of days swimming around and eating voraciously immediately. However then they started dying, about 1 shrimp a day and now I only have one left. They are living with nerite snails and glofish which are doing great. The ammonia, nitrite, and nitrate are good, KH is 25ppm. I’ve been supplementing with algae wafers which they ate happily. Any ideas?

 

[Aiken Drum]

Copper?