Wow, those are real beauties! Very healthy looking specimens that will definitely add a bright splash of sunshine to your tank! I’m very happy to hear that you’re new arrivals settled on so quickly and are eating great right off the bat.
But I’m not surprised that they feel right at home — the tank you have provided looks like a little patch of paradise for seahorses, Andrea! Lots of structure and shelter, plenty of assorted hitching posts, a variety of microhabitats, yet plenty of open swimming space too — very impressive!
Best of luck with your new Sunbursts, Andrea!