not a bug problem..... most likely its nutrient deficiancy. Make sure your checking your water for a ph balance of 6.5-7 for soil . Dont use fertilized soil AND nutrients at the same time.
You might want to go look at the pictures on this page: http://www.cannaversity.com/cannaversity/article.php?id=057 to compare to your plant(s). There are several there that look kind of like yours. You'll be able to identify a match better than me, though, because your pictures are a bit hard to see and you've only provided a small sample of the leaves.