I don't know if you eat corn on the cob down there, but it's an American delicacy. We have these small trays the size of an ear of corn, maybe 5cm wide by 15cm long, the trick is to not have high sides so you can bury it partially in the sand so they'll go in it readily. If you have access to a small oblong tray like that it would make a great feeding station for these guys. Also, get a piece of rigid airline and put it in what ever feeding station you choose so you can GENTLY blow water out of it to make the those lobster eggs move. Most fish will react to moving foods. You can also feed them black worms there too so they can be removed if uneaten.
As for your male that's stopped eating, try grabbing a black worm by the end and see if he'll take it from a pair of tweezers. Make sure you gut load those live brine shrimp with something as well, preferably green water.