To build the set of PIRANHA, I used a pencil sharpener lent by my niece.
I cut off the blade of the sharpener and left the pencil stuck in the hole of the object.

I used the pencil to set the "fishy" in a base in the scenario and place the piece in front of a stone and a plant. My challenge is to use minimum Photoshop in the images, so I decided to make a crop eliminating the pencil at base of the Piranha.
Here is one of the assemblies I used to shoot.

TRAINING IN SUB-ACQUATIC SCENES
The orange color is complementary to the blue and it makes the piece to highlight the very vibrant colors. So my option was to use other elements in the background.
But I agree with all comments: this scenario was not very good in this shot and I promise reserve more time to make many experiences when I consider the next sub-aquatic scenes. For now... what do you think about this test?

Thank you for your attention!