Should I put fish in the acquarium?

I have this beautiful orange and blue abstract painting started. It’s watercolor, 18×24, and I’m titling it: The Aquarium. 

There’s a fun, big blue splotch on it. 

I can’t help but want to put a fish in it. 

What do you think, should I paint a fish there? 

Here are a few mock-ups I did in Procreate.

Original painting, no fish:

Here’s a beta fish or Siamese fighting fish: 

Here’s a puffer fish (remember, these are rough mock-ups):

Here’s a totally made up, cartoon-y fish:

So which do you like best?