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
Weezard Reviewed by Weezard on . Yellow-white Leaf dots Hi everyone, I am new to cannabis growing. My Indica plant is 3 months old, 2 weeks into the flowering light cycle. On the first flowering week the white spots began appearing on the leaves, starting from the middle of the plant. And rapidly spreading downwards. Some leaves began to dry out. Is that some kind of desease???? Soil: compost Fertiliser: 20-20-20 (one teaspoon per 1L, every Sunday) Water: tap water (high in Calcium) Light source: Sun 291111291112 Rating: 5