hey Sarah, I think as long as the clam and goniopora aren't touching you should be ok. Also I think there is a forum specifically for clams..? Someone w/ experience keeping goniopora and clams could help out more than I.
SPS (Small Polyp Stoney) - the polyps on these corals are very small; around the size of a ball tip on a pen. ex. acroporas, montiporas, seriatoporas.
LPS (Large Polyp Stoney) - the polyps on these corals are usually much bigger; as big around as one of your fingers and larger. ex. goniopora, duncanopsammia(duncans) , caulastrea (candy canes).
