Hey Dan,
Any aeration under that pot? Are you controlling the temp. of your reservoir (i.e. heater)?What is your general location.
For a small tomato plant, and a few leafy greens this time of year you are probably loosing just as much water due to evaporation as your plants are drinking. Once you set fruit, your plant will go through much more water.
You could always set a bucket of water right next to your hydro pot with a known amount of water in it (2-3 gallons), and check your evaporation level in 7 days. Personally I try and seal my reservoirs as much as possible, within reason.
Todd
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