I realize that I've noticed this too late, and my chances are slim. I've put in some stresscoat and a few drops of prevent-ich which prevents harmful dinoflagellites and stuff from harming the fish when theyre under stress...
Stats: 10 gallon tank, freshwater, been set up for almost a year, three platies, one baby platy (three months ish), temp = 78F
History: One of my Platys has a white mark on the side under the fin. It's not the one I expected to go first...and I'm upset I didn't notice it early (but..finals week...haha..). About a month ago one of my other platys was having a problem with raised scales. I left it untreated since the fish store I went to said the price of the medicine is just not worth it. My fish actually recovered with no treatment. By recovered I mean started acting normally, the scales are still raised.
Current Issue: Sunburst platy has clear infection or disease. Only lays on bottom , when it tries to swim,w ithein a few seconds itll chose to dive headfirst..pretty fast too..into the ground and lay there again. =/ I took a picture. I understand that I'll lose the lil fella..which is upsetting, but I'm more ocncerned about why my tank has been getting so many infectous diseases, whether these are contagious or not, and whether its just sort of common for this type of thing to happen.