Do I need to show 20,000 THB when entering Thailand as a tourist?

I am not certain this is the correct place to ask this question but here it goes.

I have heard that Thai immigration is asking that you have 20K THB in hand when you fly in to Thailand.,

I have visited a few times before and have never been asked, I visit once a year and not more than 25 days.

Thanks for your responses and sorry if this is not the place for this question.