Thank you guyz..Can i know the another thing..What will happen to those red dots when they grow up....?

That will really depend on the fish in question, most if not all of them will lose the red dot eventually as they grow...
I’d even go as far as saying by the time yours reaches about 5-9” the dots should be completely gone too
Below is a pic of my old girl at around 13”, she had the same dots as yours when she was only 1.5” long...

nice fahaka....
another question..lol..im newb for the puffers.so have lot of questions..
i saw this puffer from internet..he had the red stripes.is that sub species or it depend on the tank setup..if it depend on the setup, what colors substrate or lightning help get better colors...?
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Its all the same species, but kind of like chameleons, they can “adjust” their color a little bit depending on mood and environment...
Like my old girl if she was in a good mood she’d be slightly molted in color like the above photo, but when she was in a bad mood or feeling more aggressive she would show much darker body lines and almost no molted colors...
And if i planning to keep them with little schooling fish types..what schooling fish types do you suggest to try.......? planning him to move 120gallon also