Super easy stuff to propagate/maintain?...mushrooms, ricordeas, GSP, zoanthids (although toxic), . No special nutrients needed...other than decent lighting and maintaining your water. As far as when to frag, try using the search engine on this site...you'll find a ton of threads already with all the information you're asking for.
I actually think SPS are the easiest to propagate...however require more maintenance.
Best of luck!
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Josh
Current Tank Info: 90g mixed reef w/ 55g sump/fuge.
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