It’s not an anenome,and they are quite common rather than unexpected. It’s actually a tunicate or sea quirt, which is thought to be closely related to vertabrates like ourselves. One of the forms of life that we may have evolved from (due to their spinal chord or something). http://www.tunicates.com/
Latin Name I believe is ‘Clavelina lepadiformis’ i don’t know if the colourations make a difference or if that is just local camoflage variations.

But about the photo, it doesn’t stand out in the photograph either, the lighting and framing create a very flat image which means my eyes don’t know where to look as there is no real subject.

here is a good example of how to emphasise this sort of subject

get down below the subject, shoot upwards, shut the exposure down, and make your strobe come from above more than aimed at the subject in order to create a nice black background for contrast.

You have the equipment, you just have to learn to use it right now.

I have been following some of your posts… What is your background?
You seem to know your subjects.

Good job.

1Divemaster

Water Baby
learnt to dive 15 years ago at 13
went Pro at 18
worked with Bob Sotos in Grand Cayman
then with Fisheye (UW photo dive shop) Teaching and taking UW photos professionally for 3 years.

I have spent all of my adult life diving and working in watersports / diving.
I have always loved photography, i occassionaly made money from it.

I just pay attention and learn about what I am looking at. A few ID and behaviour books, local knowledge passed down and the beloved internet.