sea cucumber

So my one yellow cucumber splitting was not enough; I saw another pink and green cucumber sitting at DA, figured id try my luck at getting this puppy to split. So far an update on the splitting would be both cucumbers are doing great, the original head opens like crazy and the little new guy...

I have a Colochirus robustus that I got a few weeks ago, he's been pigging out like a king eating anything i toss for my fish and corals. Not sure what its doing know but it sure likes like the thing is either contracting its stomach or splitting? Any have any experience with these creatures...