Help! Mangrove Jack is sick

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For their life as a whole, mangrove snappers are brackish. However, this includes the fact that they frequently begin their lives in estuarine environments with constantly fluctuating salinity. In their older age they are pretty much completely marine. I have never caught an individual greater than 4 inches in anything less than 32 ppt. (using cast and seine nets). It would probably benefit from salt. We have about 20 in our lab now and they are all in full salt. They are between 1/2" and 14"
 
they are brackish, but the kind of brackish that tolerates fresh very well compared to other brack/marines..

Be VERY VERY sure to change water when the medication period is over!! the meds can create a bacterial bloom thus killing the oxygene. A fish with a sore gill will have even more trouble handling that than it would under normal circumstances, take it from me, I lost 2000$ and unmeasurable sentimental worth of fish this way. change more than you think you will need, and then you change again..
 
He is scratching here an there, but nothing like before, I think he is OK now.

I did change the water and added carbon.

He is being kept in fresh water, he will stay in fresh his whole life. I add a little salt from time to time, he seems to like it.
 
Load him up with salt. I have put up to quarter of a rectangle take away container in at a time. No worries for barra or cat fish either.
 
if you start raising salinity to the preferred level, the overall health of the fish will improve and not be as delicate
 
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