Hi, I Purchased a new fish yesterday just to make up for numbers, and today its covered in white spots, all my other fish are fine, so I can only assume it’s a water difference from the tank water it was in, if it’s ich I have white spot treatment, but not sure if to use it with all other fish ok, and also I have a guppy fry in there so want to make sure it’s ok with them, I have posted a pic if anyone can advise pls thanks