Sorry to hear that friend. I was afraid you were gonna lose the Wolffish after I saw the last series of photos and mentioned it. When a fish gets a bacterial infection that bad,it's just almost inevitable. It looked like the stuff I dealt with a few years ago in one of my smaller tanks. Bad news stuff!!! I hope that the 100% water change got rid of whatever it was. Surely it did, especially if you didn't declorinate the water right away. Chlorine will get it for sure, but it kills good stuff as well. I've never kept any of the little, pea sized Dwarf Puffers. My teenage daughters have been on me to get a big school/shoal of them for years. Keep us informed on them, and do your best to convince me that I need to invest in some. My daughters are counting on you!!! Lol!!! Good luck to you friend.