I have a follow-on question on the behavioral changes in an aging wrasse, which I've actually been meaning to ask for a while. Until last night I had a big boy P. mccoskeri, another genus I have read on here that has a relatively short lifespan. I got him in March 2016 as a young terminal (?) male. Given the rate at which my P. piscilineatus has grown since I got him at a much smaller and undeveloped size, I would guess the McCosker's was probably already 12 to 18 months old at the time.
In the past 6 months he has stopped flashing other fishes, something that he would incessantly do to anything that swam, only a year ago. While he still had a nice dark red/orange body, his lines and markings have faded quite a bit. For the past 3 months I would often find him "resting" on the substrate. He was still eating, but in the past month or so I would often had to show him I there with the food, which would prompt him to get up to eat. Yesterday morning I found him sleeping (still breathing) in his day rest spot, not tucked away in rock where he always slept at night. He also didn't seem to have his mucus cocoon. Sadly when I returned from work yesterday, I found him dead in the same area.
Does this sound like a wrasse dying of old age? Or was something else amiss?