Awe... I'm sorry... that must be hard to see. I'm not sure of what else you can try other than frozen/thawed bloodworms... if he relished them in the past... I'd keep offering to see if he'll take a nibble.

I wouldn't consider euthanizing a fish unless you're certain he won't start eating again. Keep trying to offer some bloodworms - he might accept chopped up/smaller pieces?? It could be that the meds haven't kicked in yet.

Please keep us updated...

Michele