Nirvana Aurora Indica

Week 5 of flower, week 13 overall. Aurora #1's leaves are starting to yellow slightly. I'm assuming she's not uptaking as much N the later in flower it is. Nirvana says this is a 7 to 9 week strain so she might have only 2 more weeks to go. I'm keeping an eye on things but I don't plan on adding anything from here on out. Kind Soil says there should be enough soil in there to last through the full harvest so I'm just going to trust that and live with the results. I tried taking some pics with a bic lighter to try to get a sense of the size. Aurora #1 is a bit taller. Most her buds are about twice as tall as the lighter but not as thick. Aurora 2's buds are shorter but getting pretty fat.