this thread may or may not help http://forum.grasscity.com/sick-plants-problems/295822-pink-algae-fungus.html
also - second from last post http://forum.grasscity.com/grow-journals/286335-white-widow-bubbleponics-grow-2.html
bingo I still think it's massive over nuting like I said in that first thread - this is what happens when you go full strength from seedling be warned lol
Thats probably what it is because i just added my first flowering nutes and it probably wasn't ready for the change from veg that quickly
I know that this is an old thread but for the sake of helping someone in the future... Pink roots can also be caused by ultraviolet light. It causes precipitation of iron from chelate, leading to pinkish roots and foliar iron deficiency symptoms. Ultraviolet light can come from a number of sources including some aquarium lights, reptile heat lamps, black lights, etc..