A terrarium is only plants. During the 1970s I was employed creating terrariums for a local florist shop. What you plan to assemble is called a vivarium.
I built a vivarium and kept it going for quite a while...but...not to discourage you but only to make you aware -
looking back I wish I had only put plants and not any living creatures. The live critters need to eat and the food can be expensive. Whatever food they do not consume needs to be removed (easier said than done when crickets are hiding in and among the plants); sometimes the 'food' falls into the water source and gets pretty yucky...the entire water container must be removed and cleaned; then there is the matter of poop. All living creatures create some type of poop which should be removed or at least buried in the soil. Critters require certain levels of sunlight (real or artificial) which may differ from what the plants would like. Likewise the humidity and heat needed for the animals may make the plants less than happy. It is a delicate balancing act but, with careful planning and attention to detail, it can be done.
NGA is a plant site and even though our many members have tons of experience with things other than plants, I would suggest you also look up 'vivarium' in a Google search. You will find tons of information and some helpful chat sites to give you good information to have a successful vivarium.
