"for now on" vs. "from now on" -- Which one is correct?

I was told "for now on" is incorrect and "from now on" is correct. For example, "I will start calling you, Element, for now on." is wrong. "I will start calling you, Element, from now on." is correct.

So am I wrong? I am not very good with English. Thank you in advance. )

"If ants had nuclear weapons, they would probably end the world in a week." Journey to the Ants, page 59. Bert Holldobler & Edward O. Wilson
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