your dwc is looking great, so your doing things right, remember to check your ph every other day, also use black air tubes if you haven't already
or cover the clear air line with a rag if you havent already, light makes algae in those air tube
your ph should be between 5.6-6.2 so aim for a 6, you can get a 5.6 or a 6.2 but your plants will not be 100% happy.
i have a few dwc diaries so check them out, if you have any other questions let me know.
i will go ahead and follow your grow as well cause i know your going to be very happy with the harvest later, remember your growing in water and not soil