I use DWC in a 5 gal bucket. When the plant was quite young and small (no taller than 7 inches), a CFL fixture that was hanging fell directly on the plant. I believe that this fall damaged my plant and severed or pinched a root. The plant is about a foot tall now, with a nice amount of white roots coming in. The problem is, one of the oldest and thickest roots (the one that was damaged when the light fell on it) is brownish and possibly decaying (i'm not 100% sure...). There are a decent amount of healthy white roots. My question is... would it be better to try to surgically cut off the oldest, damaged root (which is a dark brownish color) or leave it be? I am worried about future root rot issues or some other bad related thing. The damaged root looks like it is still growing length wise, but it is still that brown color. I don't believe the brown coloring is coming from my nutes staining it either (even though I am using the lucas formula).... My nute solution smells..... earthy? i guess.... it is not repulsive or anything like rotten eggs... (and I hope it does not become that either).... I don't think it "smells like root rot"... but i VERY WELL could be wrong about that. It kind of just smells like what I would expect a reservoir to smell like (but I am not very experienced)... So the root looks like it is damaged and possibly dying but i honestly dont know 100%. How much will it hurt my plant to cut off this thick, damaged main root? There are quite a decent amount of other roots, but not a huge amount of them. Is it better to just leave it alone? Why would the supposedly damaged root continue to get longer and longer (growing)???? Thanks !