Zhang Yang confirmed the Essence of the Clouds had the ability to enlighten before he returned from the back mountain with Gu Qingcheng.

"Don't spread the news about the Rainbow Fish in the back mountain," Zhang Yang instructed. "It's not that I'm afraid someone will steal them, but I'm worried the Azurecloud disciples will go 'feed the fish.' I've raised them for so long, yet they still bare their teeth at me... These aren't demon beasts, nor are they just rare treasures of heaven and earth; I define them as fierce beasts!

They have only savage instincts and little intelligence.

Although the two large fish have been enlightened, their nature hasn't changed, and many others haven't been enlightened yet. It's too dangerous for others to go there!"