I had kribensis have 3 breeds and each time the next morning the fry population diminishes until they are all gone in my community tank. I have since put the pair in a aquarium along 6 zebra danios. The parents really protect the fry. If I put the blue moonlight light on the led during the night will it help the parents protect them more or do they need the dark time for health reasons. Or do you think that zebra danios won't be threat to the fry.