How Long Will Mature Filter Media Last Running In An Empty Tank?

Harlequins

***Corydora Crazy***
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I've just attached my new boyu external filter to a empty tank,with intentions of putting 3 corys in it later.

I've added mature media,how long before it starts dying back?

I've got visitors due,will be a bit rude to catch fish while they're here :lol:
 
If the visitors are staying a week, then you've got a problem. If only a few hours, then no problem.
 
tbh i've left my fry filter running in an empty tank for 2 weeks and its kicked back into life after only one water change. If you are worried, put a pinch of fish food into the tank or something you know polutes the water quickly, hikari first bites for example.
 

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