I have a red dragon flowerhorn he was beautiful red . this morning he turned a grayish purple. I checked his ph and it wa below 6. I don’t understand how that happened. I did have a plant that was starting to rot but still had some green leaves I was wondering If that could be the cause of it. I have now been correcting his ph it is now bet 6.8 and 7. his color is back however he just rests on the bottom near a corner. He has a ravenous appetite and will swim if he thinks he is being fed. Since this incident I have discovered he has tiny white spots on his head. He did not have these specs last night. What could be wrong. I’m really attached to him and don’t want him to die. Any help will be great. Thanks