Jack's on Third

Drained and refilled the reservoir after 2.5 weeks or so of it in there. It was starting to have a slight odor. Refilled with 39 gallons of water total. I filled the outside reservoir to 28 gal, turned pump on, kept filling until 33 gal and stopped. I then topped off the plant sites with additional water to a total of 39 gal. I added nutrients for 40 gal. Initial pH was 7.4. Then added 225ml total of ph down. levels fluctuated but seem to rest at 5.3pH. Low but fine. I don't have ph up to counter it with. All plants seem fine. #1 and 2 looking stronger but got out of their seed jackets 3-4 days earlier so they are ahead. They will all look uniform after the first topping.