Eggs are living animals with really poor mobility.
That means you need to transport oxygen and trace minerals to the egg, and mild aeration often is a good way to go.
For many open-water killifish, like most Lampeyes, it is vital. If you notice, they tend to place eggs in a place of some current flow so the eggs will be constantly washed with fresh oxygenated water. I have even had some success tumpling the eggs with a rigid airline into the bottom of a tapered pilsner glass, not unlike the way we hatch bbs.
Most puddle killies, like Aphyos, do well in a shallow Petri dish, with frequent (daily?) water changes.
HTH
Wright
01 760 872-3995
805 Valley West Circle
Bishop, CA 93514 USA
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