I have many psammacoras and lithophyllons. Psammas have a fuzzier appearance with their tentacles occassionally throwing out sweepers. Lithophyllons have more distinct mouths, larger more distinct tentacles and parallel radiating lines with no sweepers. I have the same coral as the picture. Mine is a litho. That one did not like much light for me. All my psammacoras and lithos are on the bottom.