I have a group of 5 danios in my 10 gallon and they are starting to develop red blotches around the gill area. So i did some research and it led me to believe it was ammonia burn and now I am just looking for a organically safe medicine to dose them with. They are still incredibly active but the ones with the burns, thier gills are pumping unussualy fast and I am starting to get worried, so any help would be "greatly" appreciated.