So a bit of a progress update. Seems to be doing ok, has been eating small junks of earthworm ok, but not much still. He is eating once sometimes twice a day, a 2-3 small pieces. Equals to about 1 and a half earthworms. I have been offering pieces a few times a day, leave it in there for an hour or so. Have offered fresh tilapia in very small pieces, he hasn't touched those again.
He is not eating with any urgency. But at this point we are 4 days in, so I am hoping he will perk up as he gets to eating regularly. I am planning a good water change for Wednesday or Thursday of next week and will start treating the tank with Prazi. Haven't gotten a look at his underside, he isn't climbing the walls in the stock tank like he was in the aquarium.
We'll see how the next couple of days play out.