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Hey folks,

I have a 30g planted tank and am slowly trying to 
improve my growing conditions.  Currently I have only a 
gravel substrate and would like to upgrade to flourite.  
My question is should I trash all the old gravel and 
replace completely with flourite, mix half and half, or 
do some sort of layering?  Perhaps I should use 
something completely different?  Also, can I do this 
with plants and fish in there now or do I need to start 
from scratch all over again? Thanks for your