Aww, Jupiter....
I'm sorry. That does really stink ~ and it's so hard to make decisions like that.
I remember finaly
having to get rid of my Panther Grouper (Snoopy!) - many many years ago....he just was outgrowing the tank way too fast and we had no place to put a larger tank at that time. I loved that fish - we used to 'play' - he would come to the top of the tank at feeding time and spit water at me....and always ate out of my hand.
ANYWAY....hopefully you'll get the pump issue worked out so you can bring the water level back down - I've btdt with the pump issue and rising water levels - it's a PITA!!
You'll find a way to work things out so that you can keep the eel. Where there's a will......
karma to ya when I can give it to you again.