Sea ApplePseudocolochirus violaceus Expert Only Approximate Purchase Size: 3" to 4" The body and tentacles of the Sea Apple, or Philippine Sea Apple, can be a vareity of colors, but it always has yellow feet. The oral region is usually blue to violet, hence the common name Violet Sea Apple or Violet Sea Urchin. It prefers an established reef aquarium with room to move about, and large amounts of live rock from which it receives a majority of its food. Once it