Talk:Eggs/@comment-108.85.191.154-20161227021955/@comment-5843524-20161227060831

Because you are probably opening the interface for planting seeds in the sea bed (it opens if you enter the containments facing down at all because it registers your left click on the sea bed as soon as you enter). Escape out of that and then open your inventory and drop the eggs to place them in the containment.

You can go get 4 Brain Coral samples with a knife and plant them in the alien containment's sea bed.