When the shells got air in them, the swimm at the surface of the water.
And the zoae are fast enough to swimm away. The shells will not hurt them. No worries.
When you put all megalopa in one jar, the chance of cannibalism will increase, because of less space. I lost most of the megalopa because of cannibalism (I think this is the main cause). Only 4 left
![Sad :(](./images/smilies/icon_sad.gif)