Not realy. But other fish try too spawn to. So it's a precaution. And the yellow fish is a little fish. Compare to the other one. And the yellow female like I sad did not eat enough. So it was possible that she is going to eat the egg it,s her first time spawning. My cobalt already know how to spawn. She eat what she can. Start to spawn. And than she doesn't eat for 2 weeks. Lol