I use distilled water to mist my vivarium, as it doesn't leave spots on the glass. For water dishes and to water the plants I use tap water to supply trace elements. Water in my area is very hard, with a ph of 7.8. On occasion I will water the plants with tap water and a very weak mix of orchid fertilizer. I think a lot of the nutrients for my system is supplied by gecko droppings which I spray off the glass till it runs down into the soil, and by dead crickets and other critters in the soil. There seems to be a good balance, and the soil has a good humus smell to it. I took everything out last weekend, and the soil seems very rich. If I let the substrate get too damp, I start to see mushrooms growing out of it, but it has been a while since I have gotton the soil that damp.
Chris
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