I don't currently have a terrarium setup, the last one I tried was for tropical plants: a 10gal aquarium. 1/2inch layer of 1/4inch gravel, 1/8th inch charcol, 5inches of soil; 1/2 aged compost 1/8 peat, 1/8 perilite, 1/4 sand.
Plants:3 of the same kind of fern I can't remember the name of, Baby's-Tears (Soleirolia soleirolli) and Nerve Plant (Fittonia argyroneura).
I was very carefull with the watering, as I suspeced that my last failure may have been caused by overwatering, the soil was damp but not wet and the aquarium was not covered.
Lighting: Bright indirect natural light for about 11 hours, less than 1/2 hour of direct evening sun, more like 15 minutes.
temps ranged from 75-85 degrees humidity stayed steady around 80% which should have been perfect for these plants, and seemed to be for about a month. then suddenly they started turning brown on the edges of the leaves and within 3 days they were completly wilted and dead, just like all the rest of my attempts. An ispection of the soil/ roots showd nothing, no parasites, no root diseases I could identify, and no molds
I can get african violets to grow in a fish bowl, but I can't get anything else to grow in a terrarium environment, even my "dessert terrarium" failed and I ended up with dead cacti mush.
I expect it is something really simple I am overlooking, I just can't pinpoint what... Anyone have any ideas?