I have 4 blood parrots and thay started showing signs of blackspot disease (little blackspots on body, tail and fins). I did a little research and was told partial water change and 5 day maracide treatment(treating on 1st, 3rd, and 5th day). It is on the fourth day and no sign of changes. any info would be helpful. also can I treat again soon or do I have to wait?