here's how many times I think cipro should be used in reefing: never, for any reason, whatsoever.
save its use and the resulting evolutionary adjustment from microbes as reserved for human care or advanced veterinary care having nothing to do with water-holding systems. if a doc says to give cipro to a horse and writes out the scrip, do it. we should simply not have this in reefing at all, even if it works, it's all bad because aquarists did it.
if cipro is added to this reef, and a thousand more nothing bad is actually going to happen to the actual tanks. its the collective risk we're growing exponentially and it doesn't have good outcomes. anywhere it's dosed, evolutionary change in microbes begin, and what randomly becomes of that should not be by aquarists accelerating it at lightspeed. I don't believe it would harm this tank at all, and I do believe it has a fair chance of helping based on all the total cipro dosing threads/ability to turn around melting anemones etc.
I can turn around melting anemones just by having someone run a rip clean, blue up the lights and change feeding regimen; we'll never need cipro. we remove the bad/accumulated bacteria physically vs chemically and get the same results.