Opinions on quarantining these guys

[Squeaky McMurdo]

I ordered some wild caught sailfin mollies that have been converted to full saltwater and then treated with Ich X for 3 weeks. I have my own quarantine set up with Cupramine and Prazipro as my go to medications, but where these fish were captured in brackish water and have never been around marine fish or diseases, should I even bother? Medicated quarantine is stressful and I worry about putting them through another quarantine. But I also worry about my resident fish getting something.

 

[Dierks]

Nope, the thing you will have to treat for is Internal worms. So if you go with General Cure soaked food for 2 weeks you should be in good shape. We use Black mollies all the time as canary fish for quarantine because of the exact reasons you gave. They have never seen marine disease, therefore they have no immunity to them. If you have any sort of disease in the tank, most likely they mollies will "Hit" first.

Who did the 3 treatments of ich X? Where were they converted? If they were converted in a tank/system that have been used for other marine life I would change my answer.

 

[Squeaky McMurdo]

They spent 11 days lost in the mail and survived so I ended up putting them in my 5 gallon to clean up hair algae and they are doing a bang up job. They were teeny tiny but are 3x bigger now. Their specific gravity in their shipping bag was 1.020