Welcome and congratulations! By coming here and asking questions first, you're already ahead of 95% of the pack!
They're only made of glass insofar as they're living creatures that can die when not properly cared for. People assume that VFTs work just like conventional houseplants and that's where they go wrong. Goldfish aren't hard to keep, but if you fill their bowl with soda and feed them potato chips, they won't last long. There are just a few tips:
- Mineral-free water is needed; filtered by distillation, reverse osmosis, or deionization
- Direct sunlight is important; VFTs like it very bright
- The substrate should also be low in dissolved minerals and other free nutrients; sphagnum products, perlite, ceramic, quartz or silica are a few safe components
- VFTs expect (and therefore need) a cold, subtropical-to-temperate winter each year during which they go dormant and recover for the upcoming flowering season
- Air circulation is key; the roots need oxygen to do their thing, so when it's dim outside (winter, etc.) and photosynthesis isn't generating a lot of excess oxygen, the roots should be at least partially clear of standing water so that they get some gas exchange
There are also a few tips that are much like the above, but people seem to get hung up on:
- Humidity isn't critical; so long as the plant has enough light and the soil is damp, it can draw water effectively
- Brita water is not mineral-free
- Even if it hurts your eyes to look at them, indoor lights are not as bright as the sun
- Disease (mold from stale air, rot from overfeeding) or exhaustion (not enough light, lack of dormancy) will kill your plant before lack of humidity, lack of pet store crickets and lunchmeat, lack of fluorescent lights, etc.
- You really do need mineral-free water
(Ceramic pots are OK for VFTs and CPs in general if they are clean and new, but used ones that have been exposed to tap water and conventional potting mix are no good because they contain lots of trace nutrients and leach them back out. Ceramic pots are doable, but it's mostly like Nitecrawler said. They usually aren't ideal.)
Best luck,
~Joe