I have been having problems with my Bolivian Rams. They do not eat, are turning dark, and losing weight rapidly. They also sometimes will scratch their gills on the substrate, and are usually breathing very heavily. There are no external signs of illness, which is why im thinking its an internal parasite. I have no experience dealing with parasites either. What I have done so far is done a 50 percent water change, turned the temperature up to 82, and added some salt. Adding the salt was probably a mistake because it was only a little bit, and did it more out of desperation than anything. Everyone seems to be doing fine and the rams seem to be better than they were before. Any suggestions as to what I could do to improve the situation?