Bera How to raise a blue bottom, God call for help! Welcome to discuss

Bera This is the appearance that the white background has just entered the black background. It took three months to get home. I bought it back with a light green background. How can the blue-green background be deeper? Today, I asked the senior fish merchant to tell me that basically do not turn on the lights, black background and black back tank. I have read a lot of related articles. I really don't know how to raise them. Help!

Bera BayciTR comments: it takes time to precipitate the fish when the background is still small.

Bera Youyuxinjing comment: happy National Day holiday, everyone! Top up the post