Don't know anything about saltwater fish, but a falling barometer puts fish off. This seems to be one of the few truisms in fishing. Many have speculated why. Fish have a very sensitive lateral line that can probably sense the change. Maybe their swim bladders also inflate as some suggest. Others have speculated the reduced pressure reduces the DO of the water. Maybe it is all these factors. But consider that a drop in presure fom 30.5 to 29 only equals a water depth change of around 2 1/2 feet. Fish make such changes all the time and still feed. Pressure change also seems to affect hatching insects. How the heck do they know? Mystery of nature.
"Here fishy fishy."