I found an amazing spot where there's a field of upside down jellyfish but I need to figure out how to shoot it better. I shot this with my 17-55mm at 17mm and practically minimum focus with a +3 dioptre to correct for the 8" dome. I had this lens on cause i was looking for turtles.

The problem (i see at least...) is there's not enough separation. Even with the background out of focus (shot at f/4, low light) the infocus jelly is still too similar in colour and the pic just feels 'busy'. How can i show one in detail & the whole field at the same time.
Should I try the 10.5 or even the 10.5 + 1.4x tele to get closer focus & try to "force" the perspective as they say?? should i get another free diver to model in the shot? what about the 12-24 (though mines broken now...)?
lighting techniques? jellies are hard to pull detail out of...
I would appreciate any input. I can't wait to go back again, its so creepy, you feel like the lochness monster's gonna appear out of the green fog and swoop over the field of jellies...
Cheers,
Chris