Concerning the fish list from the last page, make sure the Lemonpeel is larger than the Flame and that they're added at the same time. However in this size tank I wouldn't be doing either of them if I'm being totally honest with you - Flames are by far the most active of the genus and equal third for size (also probably the most aggressive non-Argi complex species), and Lemonpeels are the second largest of the genus and quite fighty (tied second behind Centropyge tibicen and Centropyge interruptus) so both do necessarily need a larger tank if kept in a community. In saying that, both tend not to integrate into communities in smaller systems very well anyway and as they age aggression will come to the fore - especially with two of the same genus.
Centropyge flavicauda, C. fisheri, C. shepardi, and C. bispinosa are about your only options here for a peaceful Centropyge in such a tank in a community. Even then I'd be sticking to a single specimen.