i dont think it was a coincidence because he was literally 100% normal until i installed the p/h . Of course i thought nothing of it originally because something new was being introduced to the tank. i figured it was just a process he would go through and would eventually get over it. After a few hours of cowering between the rocks i turned the p/h off. Around 7pm est i noticed him laying in the sand breathing very fast. I immediately removed the powerhead and turned the lights off( hoping to calm the lil guy down). i watched him the remaining two hours until he died. I just do not know what went wrong truthfully.