I read about the clove oil (tooth ache medication) method of euthanizing fish, but I can't find clove oil anywhere. I've been to about 5 stores now and I havent seen it yet. I got fed up and bought a similar product called benzocaine. Can this be used to euthanize a fish? I have a betta that is in horrible shape.. It just lays on his side all day every day with a giant tumor-like growth bulging out his side. If not benzocaine, what else could be used?