My betta has been experiencing fin rot and I bought aquarium salt to treat him. What is the precise percentage of water change I should be doing and how often should I do them? Also, the instructions for the aquarium salt says I should be doing 1/5 tablespoons (since I have a 2.5 gallon)...

I'm not sure how to dose KanaPlex. The instructions on the tube say: 'Use 1 level measure for every 20 L.... Repeat every 2 days until symptoms disappear or up to a maximum of 3 doses' Does this mean add another measure every 2 days WITHOUT changing the water?

so i got my little brother a fish for his birthday a while back and its been at least 2 months now since we have had him. the fish has fin rot and yesterday we bought some FURAN-2 the 10 packet which this whole package treats up to 100 gallons. the direction say: -one packet which is 85mg...