There is a protopalythoa from Florida that under white light looks brown, and under 20k or actinic is bright green, and about quarter size. I have some in my reef tank, and they are real pigs when it comes to eating. I feed them well smushed fish fillet, and mix in water and use a turkey baster. They are like baby birds and close on it and it only takes 10 minutes or so, and they are ready for more. They multiply real fast when you feed them.