Hello everyone, I have a question about my Achilles tang. I stardet my 4. aquarium and I got some new fish. A few days ago I noticed that my Achilles tang was scratching his gills and head on the sand. I don't know if he has gill flukes. He is swimming normally, he's eating normally, the water is very clean, he doesn't have ich or any other diseases. Also he's very territorial towards other fish. He's not showing any symptoms of gill flukes other than scratching on the sand. Also there are little dark white spots and lines but I think its from scratching. Today he's not scratching a lot but he's still scratching a litlle.If he has gill flukes can someone please help me i don't want him to die.