I love the tears!! SOO cute!!! I want some now! lol
As far as the film at the top, I use HOB filters so I dont have to deal with it, but I know with CPD a canister is ideal as they dont like heavy currents. Airstone sounds like a good fix for the issue.
As far as the stuff on the tears, its probably just debris, and random build up of food and what not.
As for the stuff on the tip of the plant leaf, I cant say for certain what it is...but if it is algae or even a biofilm or debris...have you considered a clean up crew? Snail, shrimp, oto? Otos will also eat biofilm. If you want a definate answer on what it is...find Byron, he will know.
The tank still looks amazing! Congrats!!
And your avatar pic, is that a julii cory?