You don't have to "mix" it, you only have to agitate it enough to disperse the oil into small enough particles that the fish will absorb it in safe amounts.
Fish may not feel pain in the sense that we do, but they sense distress and discomfort. I am sorry if I was mistaken but I was under the impression that, when getting into this hobby, we were signing up to voluntarily put these creatures of lesser intelligence under our care and give them the best possible treatment that we could. Maybe if you're not up for that you shouldn't have fish. They are still living creatures that were created by millions of years of evolution, just like you (or created by god if that's your thing). Sorry if I don't feel sympathy for your point, but they are animals, not ornaments... treat them like it. They didn't ask for you to care for them, you did.
i dont want you to cry over alka seltzer so maybe he should just take the fish over to a friend with a cat. that way the cat gets a snack and no evidence.
