Marine Betta? Will it work?

So I saw a very lovely Marine Betta at my LFS and it got me wondering if it would be a good fit in my tank. My tank is a standard 120 gallon reef tank. I am not exactly sure how much rock I have at this point, but I plan on cooking the rock I have and then add some more. Corals will be mostly softies (if my tang dosnt eat them all) and LPS I think. Not totally sure yet. My fish stock includes 1 White Cheek Tang, 1 Singapore Angelfish, 1 male Blue Jaw Triggerfish, 1 Sixline Wrasse, 2 Percula Clowns, and 1 Yasha Goby. I worry most about the goby and the sixline. I was looking at the Marine Betta and I could not really see it being able to swallow my clowns in all honesty. My clowns are about 2.5 inches, the wrasse maybe a little over 2 inches, and the goby maybe 1.5 inches. Should I be worried with these fish? Also do they hide a lot? I dont really want a fish that will remain unseen all the time. The one at my LFS was out, but then again it only had one rock to hide behind if it wanted. It would be the last fish I would add. Thanks again!