Looks like possibly too much or not enough food.... If you've fed anything at all, it's probably OVERfeeding, if you haven't fed anything but epsom salt, i'd quit the epsom salt and get some real MJ nutes and water her with a really low dilutiong of it... 1/4 strength of what they recommend. Then watch them and if you notice the new leaves showing more vibrant green color then it was a lack of food, but could be either!!! so be careful... good luck with the grow and get some damn light on that baby... she's stretched out like Inspector Gadget!!!