I have a foxface which is covered in white spot. Being treated with Polyp lab medic. The other fish which includes a yellow tang, dwarf angels and pair of Clowns show nothing. This has been a week but what I find strange is that the white spot (hundreds) always disappear on the foxface by 4pm but returns before lights at 8am. This is every day. The others remain spotless. All fish Inc the foxface are swimming and eating as normal. No scraping or distress by any inc the foxface. Why should the foxface be peppered with whitespot til mid afternoon then disappear like magic and does not show any signs of distress. This is 5 days of the same, confused why it is not suffering and why the disease comes and go each day. Any ideas