Hi Bro tineng,
I have done my part to do alot of research so don't doubt people capability if you can't do it.
btw, the species of Tritonia Bollandi feeds on gorgonian Verrucella aurantia (Fam: Ellisellidae) instead of sponge and the gorgonian is not difficult to find from the local LFS.
Anyway, thanks for your concern and all are noted.