Slow growth

Aptus is a good brand,no problem. You seem to have applied lst on them as well.you can try to increase light penetration but dont know about leds.i use two separate 250w hps lights which do big favor every time.and i go with plagron, great nutrients.i pulled 343 g from a 5 weeks vegged plant last round.i would recommend plagron. hey bro btw, feed very often like every day or every other day. coco is for frequent feeding. no overwatering problems don't worry. I feed every other day in winter and every day in hot weather. do not feed + water + feed, just feed unless you have serious nutrient excess which you don't have. Irrıgate with good amount of water, have run off. I use 3lt of water for 3 gal pots and 5lt for 5 gals.