PH regulation

What's that gray powdery stuff on top of the soil? It almost looks like bone meal, but I can't tell for sure.

And we can't really give you advice on what to do for your pH when you aren't sure what your pH is. I think I remember responding to another one of your threads recently, and you said that sawdust was added to the soil. I'm not sure if you did that to aerate the soil or if the soil happened to already have sawdust in it, but that can make the soil acidic. That's not saying that it will, because other things, such as water pH and other amendments in the soil have the potential to balance things out, as well as make problems worse. It's impossible to know without having even a remote idea what your pH is like. Nutrients get locked out when pH is at one extreme or another, so if this is the case, you'll need to fix your pH before you try correcting a nutrient deficiency... otherwise you'll just end up making the problems worse.

I'm not sure that you'll be able to save the plant pictured in your second link. Dutch Pimp is right, if it is a pH problem, you'd have to bring it back to normal levels gradually, not all at once, or you'd just shock the hell out of the plant and probably kill it anyway. And I wouldn't recommend flushing since you don't know the pH of your water, your soil doesn't look like it drains very well, and soaking wet conditions aren't going to improve matters.

Fill this out as best as you possibly can: Troubleshooting Form. And get a reading on the pH of your water and your soil runoff as quick as you possibly can. Again, I can't say with certainty that the second plant you pictured is going to make it, even if you already were taking measures to fix the problem. It looks pretty rough. But hey, we've all had to learn from our mistakes before, and now you'll have a better idea how not to end up in this position again.

Sorry I couldn't be more help.