I "had" a lawnmower blenny that was doing great. I had him for several months and he was happy and was eating great. Just shortly before his death, he got very "flighty". He would dart around the tank until he was completly out of breath and then just gasp for air(or water). He would also stay hidden in the live rock and not come out until all lights were off. When I turned the lights on this darting about and hiding would start. He finally jumped out of the tank right in front of me. I put him in a quantine tank and the would act as if he was having some kind of seisure. He would get ok and when I was going to net him and put him back into the main tank he would keep having these "seisures". I did add a coral banded shrimp about 2 days before this started taking place but I never saw the cb shrimp bother him. Any suggestions about what happened. All water perameters were normal.