try whole shrimp, krill, other meaty stuff.
he m=ight be just getting used to the tank like you said but dont try brine shrimp. i dont know if its just me but the first food i feed my fish when they are newly introduced is the only stuff theyll eat. And again like you said brine shrimp isnt reeally nutritious unless it has vitamins or something like spirulina already in it.
I'm tired of getting pointless messages. If your going to start a conversation or ask me something, keep up with it.