How much gravel for 20 gal?

d_lit_e

AC Members
Oct 6, 2007
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Right now I have 2.5 cm of gravel in my 20 gallon, I gravel vac every week and I find alot of left overs. I am wondering if I have less gravel (ie. 1 cm) will the corries, pleco and shrimp have a much easier time cleaning up the tank?
 
Well, since I run a lot of UGF/RUGF, I have about 1" over the plates, getting deeper as it goes to the back of the tank, about 2 1/2" there.
 
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