Im using a rumpeforeskin's bubble bucket, the one with the clear indicator tube on the side (meaning that light does hit a small bit of solution in the indicator tube, from my research on rumpleforeskins buckets, this is a non-issue?). Using dark grey light proof 5 gal Lowe's bucket. Temps of reservoir are 67* - 69.5*F Temps of air are the same Using Lucas Formula @ 75% strength pH slowly rising steadily a little less than .1 a day....... pH currently at 5.45 (i am going to let it naturally fluctuate from 5.2 to 6.1).... I believe this is a safe, normal fluctuation. Using a rena 400 air pump with 400 liter/hour, with a round 4 inch airstone No pests/bugs to be seen I am getting splotchy bits and spots of a light brownish color on my roots. It seems to be uneven, some splotchy brown spots here, some there. (so I dont think it is the nutes that are staining them, otherwise it'd be a uniform tan-brown color).... Using RO water. The solution does not smell repulsive, it just has a small earthy-nutey smell, it does not smell what I think "root rot" would smell like. Hard to explain the smell for me. Neither pleasant nor unpleasant smell. The solution is clear, but it has a small amount of stuff floating in it (i believe its just dust/dirt from me and the environment, or perhaps it is elements that have precipitated out of solution? I do add some ph up/ph down as necessary)..... My environment is not a 100% sterile spotless clean as a bean labroatory....Its not a nasty dumpster either though, I doubt that a little bit of miscellaneous dust/debris would do something like this.... Could it? I need some advice on this fellow blades. This is my second DWC grow, first one was in a rubbermaid tub and it was a pain in the ass. So what could cause this? It looks to be almost the beginning of root rot, but I am definitely not positive on that....The roots do not feel slimey. And the inside of the buckets walls also do not feel slimey. My growth seems to be slowing down I think... So if it keeps this up I will be dumping the solution, cleaning the bucket with bleach, and adding new fresh solution. Please help! desperately need some experienced help Thanks!