Black spots,
Leaf chewed into?
Sounds like Thrips.

If so, you can get some advice here:
Cannabis FAQs / FAQ , Recipes, Medical Marijuana

The snail trial thing, sounds like leafminer worm.
Not a big deal.

However, If you use a > 30X lens to look at those "black dots", and they have 8 legs, you have a serious problem.
And will probably be assimilated.

Spidermites can spell doom. (When they're in the mood)
If you do have the "borg" get some pictures because they come in different flavors.
Some are tougher than others.


Havin' fun yet?

Aloha,
Weezard