I have a yellow and sailfin I have been running vortechs for years and my tangs eat off the vortechs also, green mode full throttle. Must have been a freak accident, or maybe another fish pushed him in for some extra sapce lol. Id put the foam covers on my vortechs but who wants to clean them all the time. Sorry for the loss.My tangs eat off my vortechs all the time. They are on full blast. I'd wager the tang was ill to begin with. Sorry for the loss.