For the inside of the aquarium, Natalie gave me a list of supplies- the first layer was hydroponic clay pellets (1-2") which looked like chocolate candy. The second layer was CocoTek, which was 1" deep at the shallowest level. Aparently the husk of coconuts won't break down for at least 5 years -very cool stuff- and you buy it in bricks which expands to 8 times their original size. Now comes the shaping: Mark and I made two hills with a path for a stream flowing just off center.
Now we can add anything we want- the hardest part is not adding too much. We purchased three river stones and a crazy piece of african driftwood from Pet World. Natalie had some extra cushion moss we placed on top of the moist coco-tek. It really looks amazing! And there is almost no care involved. There only needs to be a very low strength fertilizer applied to future plants and the moss, and occational spraying of distilled water to keep up the humidity- much less care than my time-consuming african violets. Still thinking about adding a little sheep- on the hill grazing- just seems appropriate!