Pictures would help, a lot plants that are this age under a 250 hps should be ready for flowering.have the plants have been given any nute if not that could be the cause by this age the plants should realy be on at least 1100/1200ppms.Without seeing the plants this is all rely guess work,look at the bottom of the pots are roots showing if so re pot.If the plants are on a nute line up then they may be a salt build up but even if the plants are only been feed water they could still be salt build up flush them with some water ph it though to around 7.0.Have you been phing the water that you have been feeding.I have just seen the pictures and i have to say that the seedlings are rely in a bad way you are not gonna like what i have to say,but here goes get shut, the seedlings should be well on there way to at least 1 ft tall now but more like 1 1/2 ft.Order some decent seeds from a good seed company attitude,get a nice easy plant to start with but one that is gonna give you a nice smoke.Some thing like ak47,blueberry,nrthern lights,get in touch in box me when the seeds arrive and i will talk you through germanateing them.Have you got a exaust fan in the grow area bringing fresh air in, and one takeing the stagnent air out.I say this because these seedlings look like they have been under extreme heat this can stunt growth.It may just be a case of bad seeds but i dont think so inbox me with yr room set up......................................tyke