Looks like "tron dust" to me

You didn't pre-soak and pre-rinse the Hydrotron?

It's harmless in DWC.
(Can screw-up a water pump though)

Your gal looks happy.
If you put that white bucket in a black plastic bag the algae will stop growing for lack of light.

Aloha an' grow on.
Weezard
Weezard Reviewed by Weezard on . DWC Bucket Concerns ok thanks for reading thus far. i recently changed the water in my DWC bucket and noticed alot of "grime" on the inside walls. i think they r nutrients that kinda "settle" on the walls. sometimes i stickl my hand in their and swish it around to get them nutes flowin. is this normal? good? bad? 1 more question: How bad is algea when it comes to roots? i have a half inch aquarium tube that i use as a level indicator and i use it to inject nutes into the bucket, anyway, this tube is clear and Rating: 5