tests for me each wek. I am taking a sample in tomorrow for them to test. It tested fine last Monday and when I asked her about helping the green star polyp who didn't seem to b e growing at all, she said I could add iodine to give it, and other things of the like a boost. I left the store forgetting to get any and returned yesterday, bought the vials, and came home and put it in. Would a partial water change tomorrow help it, IF it is in fact the iodine making it sick? Is it too late?