I know the vet that I got it from wanted proof from online to say that is what I needed. Not to hard to talk him into it, he had a 150g in the waiting room.
It the vet that said no is your normal vet, I really think that I would find a new vet, and tell him about it. He is supposed to help you with your animals, who cares if they have fins or fur. Every vet that I called out by me said that they would have no problem selling to me, but they wanted to see that I at least had a dog to get the office visit from me.
The vet I used is on the corner of Lima and Cook if you need to give him a call. Nice guy, just take your proof in from a online scource. Also, you would not belive the look that they give you when you tell them you need flea meds for your reef tank.
Also word of advice, if I had it to do over again, I would treat the display. Don't move the corals if you don't have to. It will not effect your snails, but it will supposedly take our your crabs and maybe your shrimp. But that is a small price to pay to avoid killing your acros. It will cost more to dose, and to do the water changes, but I should have bitten the bullet and did it that way.