Floating starter

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Is it true that newly fed starter will float and that sam starter 7 hours later will sink?

So in most cases when the recipe says make sure you have starter that floats it should be fed starter that has a chance to double in size?

Thanks

Catching a starter after it has been fed and it's producing enough gas to float. So a newly fed starter which has bubbled up and matured will/should float. If left too long and it's past its maturity then it won't float. 

What they mean in a recipe is a fed and active starter. Doubled is fine but peaked is a better way to understand it. Some starters may triple or more. 

You want to make sure it's firing on all cylinders.