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I know they are not the clearist pics. The fish wont stay still. But it sort of looks like mold on a fish. I have never seen this on a saltwater fish and want to know what it is. He eats fine doesnt seem tobother him yet. The water parameters are has follows; Ammonia-0,nitrite-0,nitrate-10,phosphate-.1, calcuim-480,salinity-1.024.


 

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Not marine ich. Ich is characterized by miniscule white dots. The fish would have appear to have been sprinkled with flour.
 

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I know I know nothing about salt water but this looks like a really deep bruise or a cut from something. Maybe an abrasion from a really hard run with something rough and solid. The coloring looks just like a bruise and the description makes it sounds like it could almost be a scabbed although I don't know if fish can form such a thing. Also, maybe the scales were removed there from a similar incident and the "mold" is the skin protecting it until the scales can be repaired, if it has scales of course.

I see this on trout that have been kept in raceways for 6-8 months and every once in a while you see a brownish spot that turns out to be an injury from jumping and hitting the side of the raceways or the water inlet. In the overcrowded raceways it is not a good sign because they don't ever treat injuries.

Hopefully, if it is an actual injury you can treat it to prevent any infections or to keep it from getting worse.
 

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its does look like that could be it fish4all. when i looked at him closer he looked all scratched up. he has had ich and i have seen him trying to scratch it off. so it may very well be a sore.
 

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i would put some stress coat in the tank just a little bit and see if that helps. Mine gets some of that sometimes and that is just cause he is fast and sometimes scrappes on rocks when he takes off.
 
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