I introduced two clownfish into a long established tank. Water tests all came out good. My nitrate was a little bit high but nothing disasterous. Salinity was the same too. I floated them for a bit and then decided to acclimate them by adding them into a bucket and slowley adding water from my tank. They did great for an hour. Swam around, explored, etc. one started laying on its side, breathing heavy and eventually died. The one that was doing the best was swimming around the tank and just stopped. Does anyone know what happened? I feel terrible and am afraid i missed a step. I just wanna make sure this dosen't happen again.