Barb,

After my plants get started I grow them under overdriven fluorescents in tall pots made from the bottom parts of 2-liter soft drink bottles. I place the pots in trays that can hold an inch or two of water and let the water "wick" up into the growing medium.

For prolonged growth times, there can be salt build-up from tap water. I use rain water or melted snow in order to get something close to distilled water without the cost.

Most soluble nutrient formulas don't contain calcium, even though that is a "macronutrient". I use calcium nitrate to provide the calcium in a soluble form.

MM