I would start the lion and eel on gc asap, full dose as directed.
Wow, first off 6 goldfish every day sounds like ridiculous bs, most lfs lie, lie, lie when it comes to predator's eating anyway. Most times they are probably not eating at all. But 1st I have to unpack 6 goldfish, maybe a 4" plus painted angler may eat 6 small goldfish at a sitting, BUT everyday, after a few days that angler would be dead. Please do not offer goldfish or rosies, and if those anglers were eating that amount everyday, that's trouble right there.
How long have you had these anglers, if you actually saw them eat yourself, I would give it some time depending on when you saw them eat. If they had been feeding them multiple goldfish everyday, possibly just giving them times to digest and clear their system may be all they need. DID you make sure to release them under water and not allow them to gulp air. Is there any signs of buoyancy.
If possible I would not treat the anglers unless you have definitive evidence they may have internal parasites. Them not eating week to two weeks since you saw them eat would be of no concern. If they refuse food after about 10 days, then I would consider treatment, and use the 3rds method I mentioned earlier.
Here is a thread I wrote with alot of info on caring for anglers.
https://www.reef2reef.com/threads/so-you-want-a-frog-fish-i-call-them-anglers.913556/