All the ammonia gone and the big guy survived. He's still stressed and didn't want to eat. But then I started spoiling him with some frozen shrimp and frozen worms. Now we're good friends again!

Here's a picture, but I'm also attaching a 10 second video for @Kathianne - as watching him never ever blink and just breathe is so very relaxing and would never give anyone nightmares!

Notice his teethies! He's a tough bastard, very aggressive.