Hi All, Can I get advice on how to fix this problem? Some of my fish has white spots on them and they seem itchy which make them scrub to the coral sand sometimes. I just noticed the white spots 3 days ago. I have 55 gal with about 20 fishes there mostly male peacocks. I just check the water perimeter is all good. PH is 8, Ammonia is 0-0.25ppm, Nitrite is 0, Nitrate is either 5 or 10. Please help me. Thank you!