Sorry that happened to your frog.

I'm not sure what you mean by "water quality". Am I suppose to fill his tank with a certain kind of water? I always used tap. I cleaned his tank yesterday and I do it about once a month. I don't do it so often because I have a filter...

Question, should I try to force feed him. Like putting him in my hand and trying to pry his mouth open. He bit me once before, so I'm not scared of him. I'm just worried that'll make it worse, whatever it is. I want to take him to a vet but there are none near me that does amphibians. Only cat and dog doctors. If nothing else changes, perhaps I should let him go? But its mid winter. I don't know, I just want to give him the best chance.