Hi, I have a 15 gallon fish tank with four platys. I recently got 3 neon tetras but noticed they had ich so I removed them and returned them back to the store, letting them know that they had ich. Two days later I noticed a white spot of most of my platys fins. I only noticed it because, when they swam a certain angle I can clearly see it. Most times I can’t see it. I’ve heard a lot about using medication to treat ich but I’ve also heard a lot about using salt and raising the water temperature to 82°F. I’m honestly unsure on which method to use to treat ich. Please help! Thanks so much!