My giant danio has a fungal infection

Hello, i recently bought 6 giant danios and now have 9 in total. I noticed that one of my fish had white stuff growing on his or hers fins. I moved it to a 5 gallon bucket with an air stone and the same tank water that it was already in. I dosed tetra life guard and now I am wondering what else I can do to help it.
My water parameters are no ammonia, no nitrite, 25 ppm of nitrate and the ph is 7.6. I have other fish in the tank that it was in because it is a community tank. I have a pleco, two apple snails, the other 8 giant danios, a crayfish,three spot gourami and a red tailed shark.

 

Does tetra life guard treat fungal infections?

 

yes it says it cures fungal bacterial and other stuff
I really just want to know if I am doing anything wrong and if there is anything else to help him

 

Follow the directions and time. Not a lot else to do.

 

thanks this is my first time with a sickness in my fish tank and I have only been fish keeping for almost 2 years.
thanks for your help