I have a 20 gallon tank with 4 guppies 2 platys 2 mollies 3 neons and a pleco. I notice that I saw the platy and the molly rubbing their skin in the decorations. and when I put my betta I saw white spots so I remove the betta from the tank. but I am worried of my fish do they have Ich. I have my betta in the tank on one week with out white spots. then white spots came I did not saw my betta rubbing its skin in the decorations. I have a hospital fish bowl for the fish if they are infected. But I have never seen my guppies and neons and the pleco rubbing there skin in the decorations. Can I cure them in just using salt?