Rack to secondary after 4 days? Seems to me the yeast would be hitting their peak. Good? Bad? I don't know. Unnecessary? Yeah.
And the airlock means nothing. I would move my beer based on gravity readings.
Also, using a secondary is typically a bright tank, meaning its for clearing the beer. You might also use it to rack beer over fruits etc, its goal isn't usually fermentation.
A hydrometer is $7. After unnecessarily repitching it would have already paid for itself.
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