I transferred one of my albino bushy nose plecos from my 125 gallon tank to a 29 gallong tank several days ago. This is one of my fry that had grown to about 3.5-4". My 29 gallon is on a stand with a 20 gallon underneath it. While working on my 20 gallon my albino pleco got startled and darted around and finally settled down. 10 minutes later I checked on my pleco and he was swimming around like he had brain damage and sank to the bottom of the tank. The fish finally flexed his whole body, stiffened up and died. Have any of you ever had a fish die this way? I have been keeping fish for a long time and have never experienced this.