Gummy droplet secretions on the edge of leaves

There are these gummy droplet secretions on a couple leaves of one of my plants. When i touch the secretion it has the consistancy of a med thick oil. Every hydroponic shop and dispensary i went ot with these pics was dumbfounded and could provide no explanation. So here is the challenge for all you out there. let me know what you think is causing this.

ps check out this thread post about some weird leaf tip curving issues im having as well. https://www.rollitup.org/newbie-central/520136-marijuana-leaf-tip-curling-up.html

check your ph, nutes, soil, and light. ask if you should flush tho, thats what i would think.

Maybe Aphids or something else?
http://en.wikipedia.org/wiki/Honeydew_(secretion)