About a week and a half ago I purchased a calico Oranda and some amano shrimp for my aquarium from LiveAquaria. Before they arrived I did a deep clean of my aquarium by vacuuming the gravel, cleaning the filter, water changes a few days prior to their arrival. When they arrived the calico was half the size of my oranda. But he and my bigger goldfish got along well and I made sure that both got fed properly. The water parameters were clean and good because I did 2 water 40% changes a week because I know how messy goldfish can get. Yesterday I noticed my new goldie was at the top of the water "gasping" for air as it looked. My filter creates a very strong current at the top of the water, the temps are 73-76 F, I have no lid covering the tank, and more importantly my other oranda was completely fine and swimming around happy. I followed the proper acclimation procedures with the shrimp and the goldfish to minimize the stress as much as possible when I got them. I use SeaChem Prime with my water changes even though my well water is very clean and free of chemicals. The only culprit I can see might be the Flourish Excel I was using. I used some to treat my anubias in a bucket to kill off the alage and I put the recommended dose in the tank afterwards every few days. The shrimp I got went straight for my large cave decoration and have been in there ever since. I thought they might be hiding but now I think they too might be gone. Does anyone know what happened? Could it be what I was putting in the tank?