my 1st grow, i dont know what they are cuz they are bag seeds they are still in the vegitative state its been a month and about a week ago i topped them, they are under a 400w mh light and an 18/6 photoperiod, some the leafs on the lower part of the plants are turning yellow i dnt know why how are they looking to you guys they are in a 1.5 x 2 meter room comments would be appreciated thx here is the link to see the pics http://forum.grasscity.com/absolute-beginners/985282-my-1st-grow-my-1st-topping.html