Should you see a fellow photographer using a black plastic board as a stage for nudibranchs, picking animals from the reef/sand/rubble area where he finds them and placing them on the board in order to achieve a black background, how would you feels about that ???
My point is that you could achieve the same result (black background) using a snoot and the inward lighting technique without hassassing or stressing the animal; nudibranch are quite co-operative and easy subjects to shoot and IMHO we should avoid picking them up and placing them in better postions.
Moreover, would the pictures achieved the the above mentioned "technique" be accepted in a photo contest ??? I doubt any serious photo contest would accept pictures obtained by harrassing/stressing animals or by moving them around the reef ...
What do you think ???
All the Best .... Francesco