The red spots could be sunburn or rust spot. Move the plants with red spots into a shadier place in the terrarium. If this doesn't work, treat with a fungicide. If these plants don't improve under your conditions after more leaves and tendrils and pitchers have been thrown out, you may have some kind of pest. However, this is very unlikely, so don't worry too much. It sounds like you got some really crummy shipping! Hope they improve.

The ampullaria is still in really bad condition. All but one of the leaves have turned completely brown, the growing tip has turned brown, and all of the pitchers have turned black. On the bright side, there is one little off shoot from the plant. The bicalcarat's leaves are still green (all but one, which has a bunch of red spots) and it has produced a new leaf. The odd part - no growing tip. o_o

The bical. x ampullaria is ok - it's growing tip is producing a new leaf.

The ampullaria has some fungus on it's leaves (tiny white strand looking things) - so I've just been spraying it a lot with water and increasing the circulation. Should I be buying a fungicide? If so, what would you recommend?

I'm using Savage garden here: according to the book, "fluffy dabs of cottony tufts" are a sign of mealybugs. I have absolutely no experience here, but I've heard reccomendations of "Ortho Systemic Insect Killer" as a good pesticide, particularly in wettable powder. It might just be a fungus, I don't know, does it look like a fungus or some insect material? Either way, i'd treat it with a fungicide or insecticide. watch the bical like a hawk, red spots can mean spider mite, and that's bad news. Give it a thorough inspection after misting. If you can see any webbing on the leaves, treat with an insecticide as fast as you can. If not, keep watching it, I was almost sure I had spider mite on my aristolochioides, but it's fine now, so hopefully yours is too. As far as I know, leaves turning brown aren't a sign of any pest, just stress. How are your conditions? I can't see why Ampullaria would be in stress, it's such a hardy plant, which leads me to believe it may still be in stress from shipping. Sorry I don't have too much experience in pests, I've only heard them described, so I'm not sure.

95% humidity (or so my hydrometer says), good air circulation, and frequent watering/misting with distilled water. I had to clip off all the leaves on my ampullaria but one, they turned completely black. o_o

I doubt I have an insect problem in the tank...

If you don't think there's an insect problem, there probably isnt, again I have very little experience there. hopefully within a few months your plants will be looking fine. If you don't like the fulffy stuff I think you'll be able to wipe it off.

I've had a little experience with meally bugs. Until you've seen one you'd never know that that was what it was. They are little white spots, sometimes flat against the plant, sometimes a bump and sometimes fuzzy. Best way I've found to get rid of them was dilligence with a pair of tweezers and I would think a 5 dollar magnifying glass would help. (I can't believe I just now got one LOL... where has it been all my plant growing life)

There are insect killers you can use but my problems actually cleared up once I had picked all the ones I could find off.