Hi Tony;
I cant tell in the pic what it is. Red Sea sailfins do get lateral line pretty easy. Of course a good diet fixes that problem. Also the one I had years ago, developed HLL from a dusty carbon. No, ifs, ands or buts, it was the carbon that caused it. Thats why I only use a premium carbon like Black Diamond now.
If ick, try garlic as suggested. If its not far along, then that may help. I just use a liquid filled garlic pill. Cut them open, {stinky}, and mix with spirolina flakes. I also rub it all over a nori sheet.
There are a couple commercial products. Kent Marine makes one called Super Garlic or something and Ocean Nutrition, the makers of Formula I and 2, make a new food called something like, Soft & Moist Marine pellets. They are supposed to have garlic in them and fish seem to gobble them up.
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Doug
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