wow very sorry to hear ! Sounds like you are doing all the right things too recover... lots of water changes, you can do up to a 100% wc in cases like this... and keep changing out the carbon with fresh carbon
a 100% wc won't cause your tank to re-cycle... as the good bacteria is mostly in the surfaces of your live rock, sand...
but if you have die off from the "electric fire - poison" you will want to watch ... re-cycling because of any die off & be ready for even more water changes...
hope this helps & best of luck recovering !