Ya, Japanese sun = Rhizotrochus corals
Pls find some info from bluezooaquatics below:
http://www.bluezooaquatics.com/productdetail.asp?did=3&cid=54&pid=2023
If you like feed corals, it should be easier like super sun...
Ya, Sympodium, mine doing well at all level High and Low light, also all level of flow... They propagate fast like star polyps.. In summary, very hardy coral....