Is your tank planted??If it's planted and it requires Co2 injection,your fish might be suffering from amonia attack(sorry if i spelt amonia wrongly)Did you cycle ur tank? Your baby guppy might be dead,check ur filter.It might have been sucked into the sucktion into your filter.You know what?Last time when i was cleaning my filter i found out that i had a few cheery shrimps in there,large ones! If there's no sign of it in your filter.It's gone.

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