For the tail of the angler fish cartoon, we can choose a color that reflects the unique look of angler fish while complementing the existing palette. Here’s a suggestion:

 <Angler Fish Tail Color>
1. Bioluminescent Blue - 
                            
                            #A7D3E0
                         - A soft, glowing blue that mimics the ethereal look of bioluminescent creatures, perfect for the tail of the angler fish.

This Bioluminescent Blue adds a magical touch, enhancing the cartoon’s playful and vibrant aesthetic.

Would you like to see more variations for the tail color, or do you have other elements in mind to discuss?