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Depends on a lot of things:
- Water and food quality
- Tank size and environment
- Individual fish genetics
- Buyer's preference

I typically wait 6-9 months before trading/selling my goby fry. I like them to be well over an inch long and start showing some territorial behavior. Sometimes it's sooner if I need the tank space. I can only keep 1 batch of gobies per tank; 3 week old gobies will eat newly hatched fry. :?
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