So a short time back you gave me a heads up that my tank sand was begining to rust, just curious on a scale of 1 - 10 how urgent of an issue is this (for future reference, I intend to redo the substrate in the tank this weekend), and what are the reprecussions of this happening in my tank? I'm just curious because my plants seem to be growing extreemely well lately and I was curious to see if the two were related. (though i know its very bad for the fish which is why im going to redo the tank regardless)