clownfish have bacterial infection, need tetracycline :(

Hi everyone I am kind of in a bind right now...

I have had my saltwater tank for a little over 3 years now...and only 2 clownfish have been in there since the very beginning. So I have been lucky enough to have never lost a fish; but not sure if I will be able to make that same statement in a few days from now. My tank is 30 gallons and I am experiencing my first bit of problems so I am on here in hopes of a solution. I am looking for tetracycline antibiotics since the fish store antibiotics don't seem to be working (marycyn two) and I have been treating them since Sunday..anyone on here local and have any that they would be willing to part with? I would be willing to pay you for not only the antibiotics, but for the hassle in meeting me (time, driving, etc).

I am a busy student over at Cal Poly but taking care of my fish is my top priority right now so I am willing to drive pretty much anywhere to get them their medication. I have done a lot of research and I am confident that they both have a bacterial infection (not sure if it's gram negative or gram positive though). If anyone can help please let me know, thank you!

Nadia