Welcome to RP
Hindi ko masasagot kung saan merong LFS sa SG since di pa ako nakapunta dun. Hahaha
Pero this is for sure, I think you will not be permitted to hand carry corals (especially stony corals, without
securing a permit).
Marami na rin nakapagdala by check-in luggage, though I am not sure how.
I'm not much of a help, so I hope others with more experience could chime in.