One of my perculas died tonight.He was recent addition on the 10th. He was eating great, hanging out with other perc, hosting my anemones. He was doing awesome up until the about Wednesday when I noticed him swimming in one spot, fins all tucked up, ignoring food. Steady decline until tonight. He didn't show any signs of ich All parameters are in range, no major changes to tank, and everyone else is great. Hmm, just can't figured out what caused him to bite the big one. Any ideas?