bio balls

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jonny1234

Feeder Fish
MFK Member
Jul 5, 2010
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i have a 100gal tank bilt in overflow 30 gal sump . the ? is when i do a water change i vacum my sand .but before that i turn off the sump and it fills up with water is that gonna harm my bb or its ok to be underwater for a short time ?
 
As long as you dechlorinate the water, the BB would be fine.

Funny you ask, since BB are suppose to be wet.
 
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