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[GSAS-Member] Age of Substrate



Recently I have come across a few folks mentioning that substrate needs to be 
replaced every few year if not using an under gravel filter.  I used to just 
focus on getting my substrate mature but now that I have some tanks that are 
three years old I am more noticing people talking about pockets in the 
substrate holding funky chemistry and other folks talking about overly 
compacted substrate impeding root growth.

Would someone break it down for us? 

Shango
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