Hello im into my 4 week of flowering and my plants are coming along nicely! im using a 250 watt Hps light for two plants, i noticed the bottom fan leaves are starting to turn wierd colours and almost drying out, there are turning like a brown and yellow colour starting on the tips of the leaves and working its way to the stem. i thought it was because of lack of light but it starting to make its way up my plant! i dont think im over feeding im using bio bizz bloom 4 to 5 ml to every liter, every time a water my plant also last week i put about 0.5ml of ionic boost in with the bio bizz to see if it would spice my plants up! i made my reflector out of tin foil if that means any thing to any one. PLEASSSE HELP! NICE ONE WHEELER!