I am asking the opinions of betta fish owners that have a little more expiernce with them then my own. Recently, it had came to my attention that some of the things I have been adding to my betta's tank during water changes was not meant for that. I had, stupidly, taken the advice of a sales rep and used freshwater aquarium salt for every water change. My roundtail PK has retained water because of this, and I am in the process of frequent water changes to flush it out. This is now making me second guess whatever I add to my aquariums. I have cut out the aquarium, and I now just use my dechlorinator. I have been using API stress coat+. Is this a good brand to use? What are some other opinions? I have a 10 gallon, and a five gallon. Both only have one betta. Neither of them are planted, and are kept at 78F give or take a couple of degrees. They both have medium size tetra whispers.