Confusion on treating disease

[Kaste]

If I have a sick Molly fish and remove him from community tank to hospital tank, should I put any type of "treatment" into the community tank to make sure nothing is spread?  

Thanks

Edited December 7, 2020 by Kaste

[Mitch_ScruffyCityAquatics]

What are the symptoms?

[Kaste]

Rubbing on bottom of tank, laying on bottom of tank, not really moving.  Possible pop eye.   He has been with me about 3 months, however, this group was never QT'd.  I did not know about that at the time.  

I have given him the trio (Ichx, Maracyn, Paracleanse in my hospital tank.   

I did a 30% water change on Friday and chemical water checks yesterday and all good.  

Just noticed this AM, I drink my coffee in front of tank and always try to check that everyone is present and ok. 

Just worried about his tank mates.  55gal. tank.

 

Thanks. any suggestions appreciated.  

[Mitch_ScruffyCityAquatics]

If you don’t see any behaviors similar to the one I don’t know that I would worry about it. If your tank is small enough a lot of people around here would still treat them all. Depending on species a lot of fish come in with parasites. When I first learned about the trio I dosed my whole tank to make sure everyone was good. 
 

Now I use salt in my QT with everything that comes in. 
 

is the QT’d fish eating? 

[Kaste]

He is eating a little.  

 

[quikv6]

I'd add some salt as well, especially since Mollies specifically tend to take very well to it.