jemmyyong

Spawning cardinal at home tank is very difficult. Almost literatures said that, but not impossible. First separate male and female and condition with high protein diet. As I didnt know who is the boy/girl, I put 18 cardinals in small tank and give mosquitoes larva and beef liver diet. after 2 weeks there's still no different as the literature said that female will have plumper belly. does that M-size cardinals to young for breeding?

Nick Goody

First up, how old are they and what size? By the time Neons and Cardinals are old enough to spawn the females should be noticably bigger than the males with a deeper body and rounder belly.

jemmyyong

size M about 3cm, i dont know how old they are..

Nick Goody

At 3cm they should be easily old enough to breed, and sex. Males generally just look smaller and thinner. Their Blue stripe tends to be straighter than the females as well.

jemmyyong

is there something wrong with the diet?

Nick Goody

The diet sounds fine to me. When my Neons are getting ready for a spawn I feed Baby brine shrimp, Flake, and Bloodworms.

Nate McFin

have a look at this thread on another forum. This was a very ambitous project on breeding Cardinals that this member took on. It is a very good read on the subject and shows just how difficult it is to breed Cardinals in captivity.
http://www.plantedtank.net/forums/ta...k-warning.html

agabr123

what a great link! thanks for sharing!

11yancazosj

just a reply from the first post, i think tham females are more full bodied at males. i think.