I have not added any new fish or items and I’ve had these fish for 5 months. My two other clowns are white and I cannot see any white dots on them.
This one (Cheeto) is swimming very low to the ground and has these white spots. His mouth is starting to look white but he is still eating.
salinity 1.025
Amonia 0
Nitrate 20 (had a small clown die a few days ago)
Welcome to Reef2Reef!
I was able to open the video, but it was kind of pixelated. From what I can see though, the problem may be a protozoan disease known as Brooklynella. This isn't usually possible to treat without a treatment tank, and since you've lost one fish already, the disease may be pretty far along.
What other animals/fish do you currently have in the tank?
Here is an excerpt from my fish disease book on this issue:
Brooklynellosis
Cause
Brooklynellosis is caused by a ciliated protozoan, Brooklynella hostilis. It commonly affects wild-caught clownfish, thus its common name “clownfish disease.” Entire shipments of wild-caught clownfish have been lost to this infection. It is also seen commonly in angelfish and anthias and sometimes in butterflyfish and tangs.
Symptoms
Aquarists often miss the early symptoms of this malady in their fish, so by the time it’s identified, it’s often too late to save the specimen. The first signs of this disease may be limited to slightly folded fins combined with lethargy. Soon, skin mucus production increases, as does the fish’s breathing rate. The fish will then lose color, stop feeding, and hang in one location, with death following in a matter of hours.
Uronema often has similar symptoms, but a reddish underlying lesion is usually associated with that disease. Bacterial infections can produce similarly cloudy skin, but they typically do not result in rapid breathing. End-stage Cryptocaryon can sometimes be mistaken for Brooklynellosis, as well. Positive identification requires microscopic examination of a skin scraping. Look for medium-sized, barely motile protozoans that are ventrally flattened with a slightly domed dorsal side and have cilia mostly at one end.
Treatment
Few treatments are effective against Brooklynellosis, although two options include a 14-day chloroquine treatment at 15 mg/l or daily formalin dips at 150-167 ppm for 45 minutes with good aeration. Reducing the specific gravity of the treatment tank may assist the fish in balancing the electrolytes lost due to skin and gill damage. A target specific gravity of 1.018 should be maintained during treatment.
Prevention
Acquiring captive-raised clownfish as opposed to wild-caught ones is a good way to help prevent outbreaks of this disease. Also, Brooklynellosis is much easier to manage in a quarantine aquarium than in your main display tank.
Jay