Quote Originally Posted by greenmonster
dude im sure they would have said mililiters not mmeters otherwise it wouldnt make sense.
keep them moist when they are very young so the tap root stays wet.
then when they get bigger u will get the feel for how much they need by how the plants look and how dry ur soil is under the surface.
also its probs better to underwater rather than overwater if u get what i mean.
if the leaves are droopy then give um some water!
I have to disagree with a few points you made. Leaves also get droppy when you are overwatering. When they are deprived of water they seem to sag more than droop. Also, keeping a seedling moist can lead to root rot also known as damping off. The fungus is called "Pythium Wilt" and it is an instant death for seedlings. Zandor has a really good FAQ on it in the FAQ section.

Zandor's message about damping off.
http://boards.cannabis.com/showthread.php?t=36996

People usually just water when they think the soil is mostly dry. You can check this by sticking your finger about an inch into the soil and checking for moisture. Sometimes it's hard to really tell if its moist or not but you'll get the hang of it. Then, when you can afford it, you should get a quality moisture meter (the cheap ones tend to fail a lot). The people who make videos are USUALLY made for people who don't even know the basics or to just be something fun to watch.

Goodluck <3