Kennedy,
What sort of plastic bowl are you using? One common mistake among many new killifish hobbyists is that they use breeding bowls which are transparent. Fish are usually not that clever so if your bowl is transparent, they won't be able to find their way in. And when they do, they can't find their way out.
The best breeding bowls are those that are opaque and has openings large enough to let the fish in but not the peat out.
Loh K L
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