What is this?
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.
Could it be some sort of ich? Or another fish nipping at the tang?
Not marine ich. Ich is characterized by miniscule white dots. The fish would have appear to have been sprinkled with flour.
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.
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.
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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