hello, I just finished converting everything from my 45 gallon and my 14 gallon biocube into our new 120 gallon tank. Everything went extremely well. All of the fish did fine except for our lion, he stopped eating and we found him dead this morning. I have tested all of the water and everything is right on target. Any suggestion of why he was the only fish that didn't take to the transition well?? Thank you for any input you may have.