Thank you guys,
I open the rain system every night for 2-3 hours. The male also croak but just a shortly croak. In a day, I turn on the light and turn it off when the dark come. I'm not sure for the mturity of the frog that puberty enough to breed or not. The smallest one (male) size is 2 inch while the two other is bigger with 2.3 and 2.5 inch, respectively (probably female).

However, I'll try my best more realize about light and actually rain time.

Thank you very much for the comments.