I've had this clownfish for 2 years now, and over the past 6 months or so it looks like he's losing weight (there is a line visible down the length of his body). He's very energetic and eats very well. I've introduced nothing new to the tank at all, and he doesn't have white stringy poop, so I doubt that it would be internal parasites. I've been feeding him frozen mysis 2x a day with a turkey baster to try and put some weight back on him, but it doesn't seem to be working. Thoughts on what this could be, or how to put weight back on him? He also seems to have an orange/white spot on his tail where the fin looks like it's thinner that he didn't have last week.