Nice! Those are some big ole thick main roots comin out of there, I do have one question though. I think you have made the same mistake that I did for a long time and it comes in regards to the size of your airpump, on page 1 you said that it is a 600LPM pump but based on the bubbles and what I know about airpumps is that you were probably looking at the Gallons rating or the Wattage rating of the pump and not the LPM. If you had 600LPM then your bucket would be literally overflowing with water lol, so based on that and the fact that there is not much scililal root growth(the smaller finer roots) just the big ole giant dreadlocked lookin ones it lets me know that those roots can handle a LOT more air. If you will notice in the picture of my rootzone
View attachment 561230 how many little roots there are along with the big ones and they are white as the driven snow? I have a theory, and I may have already explained it here in this thread, that by putting about 50LPM into a 5 gallon bucket you will provide more than enough O2 to the rootzone to grow the biggest plants possible. If your pump is a 600 gallon it is probably in the 15LPM range.
This has prompted me to create a New thread in the Hydro section because I am seeing a whole lot more folks growing in DWC and this is the biggest issue I am seeing, is that people aren't using enough O2 to their rootz to maximize the other variables by doing DWC.
The whole reason you want to grow in DWC is to get the most amount of air possible to the root zone. Your grow is by no means in jeopardy but if you truly want to maximize your overall output and quality you will get more air to those roots
I suggest around 50LPM for each 5 gallon bucket if you can