From my understanding, christmas tree feeding is the most difficult part thus its recommended for matured tank and experience reefers.
"The Christmas Tree Worms, Spirobranchus are an intermediate sized worm, and in the lab they appear to feed primarily on detrital floc, phytoplankton and ciliates. However, feeding preferences and strategies likely vary among species, and there are very few studies examining the natural diet of these worms. In the absence of such studies, we have only distributional studies suggesting that certain particle sizes or abundances are appropriate for certain species of Christmas Tree Worms. For example, some species, such as S. tetracerosain thrive only in highly turbid water with high organic particle counts of intermediate size; whereas others, such as S. giganteus, are never found in such habitats and only thrive in areas characterized by clear water with relatively few tiny organic particles (Frank and Ten 1992)."
Just to share some info.
Cheers
JC