Auto Northern Lights in coco/perl

Day 15 - 22.1*C (72F) 73% RH. Fed the plant (mostly closest to the edge of the pot) 1L of 593ec, 5.77pH solution (0.4Ca, 0.1Mg, 0.2Micro, 0.2Gro, 0.2 Bloom). The hygrometer fell and completely smashed the plant while I was fertigating... Got about 1% runoff which came out at 645ec. The issue with seedlings in 5gal pots is the salt buildup since I don't think you can water til runoff. Should be fine though. Day 16 - Seems that the plant is OK and growing. Temp 22.5*C (72.5F) 72% RH. Day 17 - 24*C (75F) 54% RH. Fed the plant 1L of 650ec, 6pH solution. Day 18 - 23.5*C (74F) 72% RH. Medium still wet so I'm not going to fertigate. Day 19 - 24.8*C (76.6F) 66% RH. Fed 1.5L of 728ec, 5.7pH solution (0.6Ca, 0.2Mg, 0.6Micro, 0.6Gro, 0.4 Bloom). Got ~ 25% runoff which came out at 682ec. Increased light intensity to 80%. Day 20 - 22.7*C (73F) 72% RH. Plant is growing nicely now. Day 21 - 23.2*C (73.5F) 82% RH. Fed 776ec, 5.74pH solution (0.6Ca, 0.2Mg, 0.8 Micro, 0.8 Gro, 0.3 Bloom). Got approx. 25% runoff that's 886ec. Increased light intensity to 100%.