I bought 3 Amano shrimp yesterday for my 30 gallon tank, which us fully planted. I have 8 Pristella Tetras living in tank. Two shrimp seemed fine yesterday, one was circling every glass on the upper portion of tank most constantly. This morning they were all three on the upper edge of HOB just above where water tumbles out. I ran my water for several minutes when I filled tank weeks ago, it has cycled, (I seeded tank) parameters normal though my ph is 8 out of tap. Temp between 78-79. My water pipes are copper. Could the water still be toxic to shrimp? They are still bunched on the HOB now 8 hrs after I saw them early this AM. I used prime for all water also. I also have rwo small terra cotta pots planted and submerged in tank.