Thank you S&P, and Dawgluver :)
Yes, white and brown rice are different in cooking, but over the time, I manage to find the right amount of water for both of them. Well, by "right", it means none of my kids complain about it. Hehe. Tho the white rice might slightly too soft for other people.
I've been cooking like that for years using teflon bowl rice cooker. But yesterday was my first time using stainless steel bowl rice cooker and it was freaky to see black/bluish rice!
I'll try your advice, S&P! I'll report the result ^.^