My big silver was fine until I decided to do a small water change. I barely changed 10% of my tank water using my Python and added 5 full caps of API Stress coat. Within a few hours of the water change, the aro was barely moving and my pleco started sucking on his sloughing slime coat. The gar and CK's were fine. Before and after. What is going on? Our City water comes from Big Creek Lake. I think it is too much cloramine. The tail will grow back but I will be hesitant to change the water. Any ideas?

