How long will B.B last in an empty tank?

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burbon44s

Candiru
MFK Member
May 13, 2012
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milwaukee
I have a 210 that's been established for years. Its running with 2 Fx5's.Last water change was 2 days ago
How long before I need to get fish back in it?

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Technically, BB live off ammonia, not fish, so you don't need fish, but I know what you mean. You do need a source of ammonia, unless your tank already has ammonia.

It doesn't matter how old the tank is....if the BB ran out of ammonia, they all died not too long after, unless you kept the tank temp down around 40 F. If you were feeding fish there within the last week and want to keep the BB alive, just add the appropriate amount of ammonia every day to feed them.

You can keep BB alive that way indefinitely.
 
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