so heres a pic after i got rid of the white stuff sorry forgot to take it before, but as you can see the gravel on the right is blackish and it smells strongly of hydrogen sulfide. So im guessing that the white stuff i saw on top was caused by the anaerobic environment of the hydrogen sulfide?
and so how do i get rid of this? my microsword used to be there but it was dieing so i got rid of it. Is this leftover root residue? how can i get rid of the black gravel thanks!!!