- Design a terrarium only when you have learned enough on Carnivorous Plants. Internet and Newsgroup are  good
   resources. 
- Make experience with pots before proceeding with a Terrarium. 
- Don't  force  plants to be just beautiful as you'd like, allow them to be sound in wind e limb. Pruning only if necessary, don't stimulate too much growth with insects, ants, bugs, crickets, never fertilize ( chemical products contaminate  peat moss shortening the life time). Use insecticides and fugicides with care, these products could upset   the equilibrium of the whole small ecosystem killing also "good" and essential  fungus and bacteria.
- Use only soft water from spring (test it before use), rain water (only if you live far from towns), or reversal osmosis (RO) water. For my Terrariums I use both spring-water and  RO water. Never use demineralized water because chemicals
   dissolved in, could cause problem in a few months.
- Try to grow plants that require alike care and environment ( soil, temperature, light, dormancy etc.)
- Remove dead leaf only if they can became a serious risk like fungus botrytis (Grey Mould) especially for indoor Terrarium
- Monthly sprinkle water from overhead . This operation wash pot and moss, cleaning the pot surface and  giving new air to the internal layers with great advantage for roots. Don't be afraid if your plants seems to be unhappy: in the Wild It rains.
-  In  soak areas algae may appear. If you don't  remove them, after few months a nice moss will sprout and algae will disappear, this is a nice but could be a problem for seedlings and smaller plants. 
- For indoor Terrarium a photoperiod of 16 hours It's enough. For outdoor Terrarium use a light sensor to synchronize sun and artificial lights, otherwise dormancy period will be killink the plants.
 - Use fluorescent lamps like GROLUX Sylvania or AQUARELLE Philips and add a white cool tube to correct the colors ( 1 white every 3 ) . Using gas discharge bulbs (metalarc) is best.
 

As previously discussed , Nitrogen build up and hydrogen sulphurate are problem for most CPs, also oxygen lack may induce anaerobic bacteria to reproduce. What to do at this time?

-  Avoid Nitrogen builds up growing non-carnivorous plants in the same substrate of CPs as  Adiantum capillus veneris (Maidenhair) or nephrolepis  fern.
   Their  roots gets nutrients (in particular Nitrogen) by the water.
   This is a phytofilter that works properly. When  Adiantum capillus veneris or ferns becames too tall it is possible pruning or remove plants, spores are always present and new plants will germinate. 

- Avoid water stagnation. Our original project requires two water pumps (available in aquarium-store) providing sufficient water shake and the possibility of gaseous-exchange. 
Both pumps are placed on the bottom of the tank: the first one pumps water to the opposite corner of the tank.  The second one  makes an endless dripping on the water surface allowing gaseous-exchange.
 This water closed circuit prevents hydrogen sulphurated storage and helps oxygen to be dissolved in.