The brown crispy edges on the leaves can be two things, actually three. Did it have them before you sprayed it with the fungicide? if not, it might be leaf burn because of the type you used. If you're fertilizing once a week, and not leaching the soil to the point where water runs out the bottom holes, then it's probably a build up of fertilizer (salts) and your roots are also being damaged. To fix that, fertilize every other week and flush the pot with water in the week in between.
It could also be lack of humidity, but if you were having some kind of a fungus problem that might not be it.
Also most plants like to be watered before the point of wilting, but just before. I know it's hard to judge that, but that wilting can also cause leaf damage.
I'd have to say overall it looks like a great plant for indoors...Congratulations!

Hi Sandy, thanks for the response. TO answer your questions...

1) The brown crispy edges appeared before the fungicide. I took a leaf into a local nursery and one of the workers said that it was a combination of poor light (hence the lamp) and fungus.

2) Ah, the terracycle stuff said that it won't burn plants as it's basically worm poop in water. BUt, I suppose too much of anything is a bad thing.

3) Yeah, I'm still trying to figure out the whole "when to water" thing. When I went on vacation to Hawaii for a week I pourd about a pint glass into it...when I came back it looked great! I think I maybe overwatering come to think of it.

What about the brown stem part? Is that worrying?