1000% agree with this. I grow corraline like crazy but my acros grow SO SLOW. Now torches and zoas i can grow them all day.This is not true. My corraline is growing out of control like plating out of control but get slow growth on alot of corals. Alot of my lps and a few acros mostly. Montis ,some zoas, duncan ,stylo cyphastrea leptos and of course green star polyps great growth.
IMO there is no secret sauce. Just every tank is different and you cross your fingers that you have one that grows corals well. I'm about to start dosing a lot of PNS ProBio to try something new.