Brine isnt the top food you can feed, try mysis or even pemysis if you can. I also get rods food sometimes, it has big chunks of seafood and algae in it but its very pricey, like $20 for a frozen pouch. I feed mysis, brine and bloodworms every day with supplemental feedings of rods food. All my fish really seem to like it and its got plenty of nutrients that way.
As the clowns become more accustomed to their new home they will venture out more and more but dont be surprised if they tend to stay in one spot alot of the time, just their nature. lol