Cucumber ID?

[Genera]

What are these three cucumbers? I know the yellow cukes are Colochirus Robustus from the Indo-Pacific. What are the pinkish gray ones in the pics with the yellows? And what is the one brown/black/gray/white one?

Yellow and Pink/Gray

Yellow and Pink/Gray

Brown/Black/Gray/White

(sorry about the bad pics, my new camera is on its way)

 

[Genera]

Anyone know?

 

[JwAllen]

Not sure on the exact species, but the cucumber in the first 2 photos are filter feeders commonly found in Caribbean live rock. They are mostly gray and may turn pink as they grow. Most likely they will find a place they like and suspend their mouth parts similar to how the yellow cuc is doing.

The second cucumber is of the sand sifting variety also found in the Caribbean. I have seen them all black, black and white, tan, brown and gold. They need lots of sand in order to meet their feeding requirements. You should see them swallowing sand and then the sand coming out the other end in clean white pellets.

 

[Genera]

So they are from the Atlantic! Good. I have Caribbean biotopes and didn't want to ruin the biotope.