Do NOT, absolutely DO NOT use Marine Melafix!!!! I used it for two days, because one of my marine fish had a minor case of fin rot. All my other expensive fish that I've had for years had absolutely no healh problems. I used the exact dose they recommended on the bottle - 5ml. per 10 gal. ALL MY FISH AND INVERTS ARE DEAD ON THE SECOND DAY!!!! One coral has magically survived and 1 clownfish and 2 chromises. My star fish was lying belly up, but still barely alive. As soon as I did a 50% water change, replaced the filters and turned the protein skimmer back on, the star fish got up and crawled back in his favourite spot. All my cleaner shrimps ($40 each are dead). I cannot tell you how pissed off I am at the company!!! This happened just on the second day of the treatment!!! I've used the Melafix for my freshwater fish before, and it worked great, that's why I trusted the company and purchased the Marine one. They should take the product off the shelves ASAP!!!