Sand in tank ?

[Mm16]

I have a mates pair that I would like to put in my sons 12 gallon bio cube. Currently it has sand, is it ok to have sand while breeding clown fish?

 

[wkscott]

Is there sand in the ocean?
It’s okay to have a sand substrate in the actual breeding tank.
You'll most likely want to move the fertilized eggs to another tank to raise the fry. In my fry tanks I don't use substrate as it's easier to keep the tank clean and I believe that the fry can find their food easier.