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>> Why would one want to stir up the substrate in a planted tank?
Well one reason that comes to mind for me is I had a high nitrate level
and there was alot of organic material in the substrate. so I up rooted
all the plants cept the crypts and stirred up the substrate while
running a filter. No3 was reduced from 100ppm to 50ppm. Under normal
cleaning conditions I would not stir up the substrate cept for top layer