Hey Raelum, your babies look good so far this round.
You seem to be very passionate about learning how to do this thing.
I have a pointer for you that I'm 100% positive will help you.

This plant is a weed, it literally THRIVES in nature with no intervention from man...
They don't need a lot of help to do what they do. They don't need you to help them shed their seed shell... They've been doing it for thousands of years already

What I'm trying to say is that while I know it's really difficult to resist the urge to love on your plants, you really gotta just let them do their thing... That's what killed your previous attempts, not damping off or anything else... You loved them to death.
Here's the deal:

All they need from you is a comfortable temperature with good air cirulation, good dirt, clean water with a little nute added, and a nice bright light timed to the right schedule, and they'll do their thing.

Go get some real potting soil and lose the manure... it's too hot and will burn your babies. Adding perlite is good.

Don't overwater. Let the dirt dry out between waterings, so the roots can breathe in between meals... It doesn't need to be constantly soaked.

If you do these things and above all have patience, you will see good things happen... I promise.

Wanna see some nice plants? Check out my grow:

http://boards.cannabis.com/indoor-gr...-grow-log.html

Best of luck to you Rae!