I noticed yesterday one of my fish was seemingly resting at the bottom of the tank. Today I noticed both of my fish have white spots on them. Not a LOT, but it's significant I guess you could say and noticable. I took both of them out, added non-iodized salt, then put them back in while adding a bit warmer water. What else can I do to get my fish back to their normal selves? What product should I buy?