Even if they accepted brine which is a good possibility it really has no nutritional value and without a constant source of pods they will still starve unless you can teach them to accept prepared foods. They really need a very mature tank with alot of LR to survive.
Maybe adding a refugium were you can grow pods without fear of predation would be a good way to provide a constant food source for them.
Feeding a Mandarin part
Feeding Mandarins part 2