I know my name isn't Lynden, but if you ask me that fish list for a 50g is both overstocked and a recepie for disaster. Maroon clowns are bigtime bullies and in a small tank like a 50 may end up killing other inhabitants longterm. Also, a mandarin is not suited to a tank this small. Bare minimum of a 75g, prefferably a 90g. Perhaps ditching the maroon clowns and instead having something like a niger triggerfish would be a better option. But I'd listen to lynden on triggers since he's definitely "the man" in that department 

For future reference, that genus does not feed on coral, but they may attack polychaetes (including tube worms), small shrimps, and small snails, especially if underfed. 
they are so cool. also found a tiny sea slug and what looks like a sea worm. is this okay for them to be in there? i have heard about them hitchhiking like mantis shrimp so i guess it should be okay. just want to make sure. dont think i will get the rigger or the lineatus or labouts. so here it is i think