Something is changing

i have a male and female kribensis.They are still small and lived in a 50 L Tank.Today I moved them to a 160 L tank and the male's colors are more bright and on his anal fin has a little bit of blue.Should I be worried or not?

 

Could be that the male is displaying breeding colours.
I have never kept Kribensis. Google it i could be wrong

 

Ok.Female is also doing the same.But here stomach is red.I cant see him now.

 

Found these two links after googling : kribensis colour changing == Hope it helps

http://www.justbajan.com/pets/fish/species/krebensis/index.htm
http://www.aqua-fish.net/show.php?h=kribensis1

 

Mark d if the female belly goes red it ussually means breeding time.