What is your medium? It will govern how many times you feed her...just make sure your not too careful with feeding so to speak... nute burn is bad, but Deficiencies can be much worse during flower... Feed her as much as she can take, just keep an eye out for burn, and when you see it back off and keep the nutes as is... I use about 3x the specified amount of nutes per litre of solution, the amount of nutes will depend on how big your plants are, and how hungry they are... Hope this helps, and light leakage is a problem, rule of thumb is no more light in your grow area than that of the full moon, However pitch black dark periods may increase yield.... Happy growing