check ph run off in soil.. to low or to high will fuck up grow.. flush if it's high or low a good ph.for run off is 6.. good luck.. and don't use to many nutes less is more.
best results ive had personally is watering at same temp as grow room. doesn't shock them as bad to hot or to cold isn't good. keep a supply in room will stay same temp.. and if it from tap. sitting for a day or 2 will evaporate little bits of chlorine that's in tap water also