I bought some cardinals from my LFS about 3 weeks ago. They range in size from 1/4"-1". My question is, They have no red band on their bottom halfs.There is one fish that does, and it is a dark red color that looks great, but the others have no red in them. They have the blue strip but no red. So I was wondering if they have to get more mature to show their true colors? Do I need to change their diets to get their true color? or did the LFS sell me some neons instead of cardinals?