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substrate question
I have a question---I have a 90 gallon well planted tank with an Eheim
canister providing filtration. When cleaning/changing water I clean the
gravel and pull up very dark and nasty smelling compounds from one area of
the tank. I have read recently that one should not disturb the substrate of
a planted tank, and was wondering if I should then leave this smelly dark
substance in the gravel for the plants? Thanks,
Don