Legalized grow attempt #1

Week 3 from when the seeds hit the paper towel has started. Moved everything into the other space today. The furnace room was too warm and the res temp was way too high. It's now in another basement storage room. Ambient temp is 16°C. It should warm up once the bloom light is on. Once the seedlings are established more I'll move them to my large reservoirs and turn on my viparspectra to veg. Fresh res change, 1/4tsp/gal nutes with 2ml/gal hydroguard. pH ~6.0. Leaving it all alone for 2 days while I'm out of town so I'm hoping it'll all be alive when I get home with my new air pump, air stones, and small clip on fans. Need a few temp/hydrometer gauges for the tent as well. Roots on D1 are coming in really nice and appear to be looking for nutes. Update: thank you to Athos for answering my question! Not sure how to respond there as I'm too new to using this site. I was suspecting it was lack of O2 in the res. I've added another small Aquarium pump and 2 more air stones before I leave for 2 days. Fingers crossed D1 is perked up on as Saturday night when I return. I plan on getting a few final items as well. New pH and ec gauges, temp/humid gauges, clip on fan, exhaust fan for veg chamber, and a few other odds and ends. Check back Saturday night for my next update to this week Update After adding the second 4w air pump and 2 air stones and leaving everything for 2 nights it looks like the ladies really enjoyed the extra air. pH right at 6.0. Unfortunately the grow shops I visited had insane markups on all their products (50%-60% over online prices) so I decided to wait and order a new air pump online and get some hydroponic air stones as well. Day 19 update: noticed some discoloring on the leaves of D1. pH is good, should be adequate o2, temps are ok, growth looks ok, roots are clean and growing amazingly, so I decided it was time to transplant into its own res. To begin vegetative growth. Added 25L water with 2ml/gal hydroguard, and 5ml/gal nutes ph 6.3. D2 seems to be about 4-5 days behind D1. D2 roots just poked out of the net pots. Should be able to relocate into the veg res in 4-5 days. End of week 3 update: Some Brown spots on lower leaves and still increasing after adjusting the pH from 6.5 to 6.0. I'm thinking it's looking for more N. Going to wait a few more days before adding anything to the res. When lights go out the temp drops off quite a bit (22°c to 15°c) which spikes the humidity from 50% up to 80%. Time to do some work on the exhaust system to get things more stable. Hoping to do her first topping in a week to begin mainlining her.