What type of rainbows were you thinking of getting and what size tank where you going to put them in .I am not sure about cardinals and the bigger rainbows ,i have baseman's and reds the baseman's grow to about 4" and the reds to about 6" and they love live food, they only have small mouths and throats but they love to eat crane flys that get in the tank which i thought would choke them but down they go ,so i would not put cardinals in with my adults the same way i would not put neon's in with angels .Do you live in the US if so i have a good site that sells good quality rainbows .
