So I am doing a water change and I noticed an unfamiliar creature crawling out of a live rock. I have a pink sea cucumber (just purchased a week ago) and this small worm-like organism resembles my sea cucumber. Could my sea cucumber have had a baby? If not, does someone know what this is? I’m baffled. I’ve attached three pics of the unknown organism, and the fourth picture is of my pink sea cucumber.
.
.
