Need help dealing with unknown problem

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Fire Eel
MFK Member
Oct 11, 2008
1,895
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Malaysia
So I added a pleco yesterday that was not quarantined and now my cichlid is staying at the top corner and refusing to eat..
I've removed the pleco after noticing the strange behavior(the cichlid also scratched around) but is it too late?
The pleco has been in the tank for more than a day..
If the cichlid did contract diseases or parasites from the pleco, what should I do?
I've already changed the water twice today and added salt.. Not sure what else to do since I've no idea what I'm dealing with..

The cichlid is the only fish in the tank with no decor or substrate..
 
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