Possible Cardinal Spawning Behaviour

[Asteria]

Well as i sat watching them today, i notice some where 'flashing' or 'Flicking' along anothers side.
i read before, somewhere that this could be a mating ritual.
If so what else should i watch out for and where would i find the eggs?

I have many live plants a coconut and some wood in this tank

 

[leviethan]

that is where you will find them, many tetra species lay eggs under leaves, or in dark hides, be careful when looking, lol they squish easy