[APD] Teardowns?

["David Terrell" <dave at terrellclan_com>]

I'm just wondering why/when people think it's necessary to teardown a tank?  I've had my tank setup for nearly two years with a laterite substrate.  The _only_ reason I could think to do this would be to replace the substrate if it ever lost it's 'charge' so-to-speak.  I could also understand a 'teardown' of sorts meaning just to uproot everything and rearrange it in a new way...

-Dave
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