hi my name is kolo and I interested in the opae'ula because it looks cool to take care of. this came from the island of hawaii and it came to us. that green stuff is like plankton but its different because plankton is not really green.its spirulina. that can be made for humans too. the Opae'ula can die from warm and cold air. so don't put him anywhere cold or hot. put him about warm cold.