I feed mine a mix of reef roids, coral frenzy, and cyclopeez and target feed twice a week. I also feed each mouth a couple chunks of squid 1 a week. My wall hammer is a picky eater
+1 to letitreefs post. I recently put my branching hammer in moderately strong but indirect flow and what I consider lower light and I've never ever seen it look better.
I never feed my frogspawn and it looks and grows great. It will open in lower flow, but since your tank is so new and shouldn't even have corals yet, its hard to say if there may be something else going on.