Laurence is doing much better now. I added a half dose of salt to his water and I let him flare at himself a couple of times a week via a mirror.
His appetite has improved, I no longer have to feed him one bit at a time, I can put a few in and he'll just eat them himself, yay!
And, he's now building bubble nests, yay, yay.
What a relief, I was a little worried about him. His tail is growing nicely too.