No sooner than 2 weeks after the eggs hatch. Keep them in the breeding nets, I wouldnt strip them unless they get fatigued or start to lose too much weight, otherwise they should be fine. If they are too small, get too hungry or feel too stressed they will eat the eggs or release the fry too soon so try and make them comfortable.
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"There he goes - one of God's own prototypes -
a high powered mutant of some kind never even considered for mass production.
Too weird to live, and too rare to die".
Fear and Loathing in Las Vegas