Based on what I've read, you might also want to have trimethoprim-sulfa on hand too, in case it doesn't respond well to ciprofloxacin.
My impression from the research I've done on Gigs and Mags leads me to believe that they are comparably demanding to difficult SPS in terms of their environmental demands, but are much more fickle, ship horribly, and are tough to get acclimated without opportunistic illness setting in.
Usually with SPS, if you give them the right flow, lighting, and water conditions they tend to thrive and remain hardy against minor and passing stressors. You don't hear about people setting up QT/TX tanks for their Acros with multiple types of antibiotics on hand and a plan to do 50%+ WCs daily.
It seems like the majority of people who get Mags and Gigs to survive in their tanks go through a thorough and labor intensive QT and treatment process. The majority of SPS will be 100% fine if you just pull them out of the shipping bag, give them a quick dip for parasites, and toss them in the tank. 5 minutes and a few mls of Bayer vs weeks of time, dozens of gallons of water, and a course of heavy-duty antibiotics.
That said, I also get the impression that once acclimated, healthy, andsettled into an environment they're happy with, even Mags and Gigs can be pretty hardy, if a bit more unpredictable than SPS.
At least they're easier than Dendronepthea!