I bought this product as a precautionary measure because my new guppy had some holes in his tail. Based on symptoms, it seemed to be bacterial fin rot. There was no indication of anything fungal, and it seemed to be in the early stages because the fish was acting normal.After one day of using this product as directed, the water in my tank was light red like diluted cranberry juice, and the fish was acting lethargic. After using it the second day, the water was so dark red that I couldn't see my fish anymore. I discovered upon investigating very closely that my guppy had died. I don't think the fish died of any disease, because he was acting fine before I used this product. Also, my two other fish were showing signs of stress (chasing and nipping at one another), which I had never seen them do before. I immediately removed the dead fish, changed the water, and contacted API customer service to ask them why this had happened.Disappointingly, customer service gave me a generic answer about how if a fish didn't improve after treatment, then I must have been treating for the wrong illness. This answer of the fish would have died anyway makes no sense given all the information I provided. They also provided no explanation as to why my water would have turned almost black. My guess is that either you are supposed to adjust the dosage based on the actual water volume and not the tank volume (which means I overdosed the fish), or the instructions apply specifically to tanks with mechanical filters and do not take into account sponge filters. Either way, I am very disappointed in the product and the way that API handled my complaint.
Rating:
[5 of 5 Stars!]