I know what you mean David,I call it a "masochist game".With fish larvae,they make it or they donÃ"šÃ‚´t,no suspense,you know the results in a relatively short time.
But larval shrimp feed well and grow,and then,a % begin to die after every molt.But some few seem to keep growing and your hopes rise again.But no,they die again and then it is only one and this one keeps running and every morning you rush to check it,with your heart bouncing until you find it.
Pathetic thing a grown up human so concerned about the fate of a bug about the size of a mosquito,somebody said.
And one day,you find it dead.Game over.
Last time I had one surviving 99 days.