Endli shedding some slime?

[batang_mcdo]

Just noticed today my 15 inch Endli seems to be shedding some slime?
Earlier i found a piece of uneaten fish. I did a 30% water change, removing uneaten food.
Also added 1 tablespoon of salt per 5 gallon water and melafix.
What could be the cause of the slime shedding?
I've tested and no ammonia was present, also ph was not acidic.

 

[TakeNotes]

You've done good so far. Turn off lights for a day and do another water test ina few days. May just be stressed. My fish shed their slime coat only when my water was burning them. Check nitrites and nitrates.

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[batang_mcdo]

thanks, will also do nitrate and nitrite test