Large fish eating anemones are fantastic subjects to practice on due simply to the fact that they aren't going anywhere.
For this shot, I took my time to try to fill as much of the frame as I could with the anemone while tightly controlling my strobes to only light the subject.
Shooting the Tokina 10-17 in a mini dome, you have to get close. At just a inch or two from touching, it can be a challenge to not get shadows on your subject.