I had 2 clownfish, of which I saw a few white dots last week. I fed them garlic food for a few days and it seemed to go away. yesterday it suddenly got worse and this morning they were dead, they were both completely covered in white dots. these were my only fish. I dont want to give up this beautiful hobby and Now my question is, how do I make sure that my aquarium is 'clean' again and that the white ich is removed. how long should i run fishless? and can this harm my coral?