The temperature in my tank was at about 84-85 degrees
was adding salt once a day, at about 1/2-3/4 teaspoons each day for the last 3 days.
I then noticed on the third day that all the fish were fine, but the fire eel didn't seem as lively is its was before. I decided to stop adding salt until he was back to his usual self.
Went back the next day to check on him and the active and friendly eel was immoble.
Im still not 100% sure the exact cause if this, if its not a combination of things, but it is with sad regret I announce that my eel is now lifeless.
Poor guy...didnt even get the chance to watch him grow. One day I will get another, but not until Im 99% sure I can take care of any problems that may occur with ease.
But thanks for your help everyone...