Switch to mysis and see if they eat that because frozen brine isn't very nutritious unless it is vitamin enriched which is still barely enough to support the fish. Better off used as a treat IMO
. The clowns may be fine now, it's when they get a little older that you will start to see agression issues. That top corner is probably like a safe spot to them I guess. They should start to move around the tank once they get used to their surroundings.