Ideally I want to establish an environment suited for plants going into the tank. These plants will be: Hemianthus callitrichoides (Dwarf Baby Tears), Eleocharis acicularis (Dwf. Hairgrass), Sagitaria subulata (Dwf. Sagitaria), lobelia cardinalis, and a small chance that cryptocoryne parva will join them. With these plants considered, a pH value around 7.0 would my best hope. Being no more than 7.4 and no less than 6.5. Consequentially the hardness value would be 8 or below in relation to pH.
In fact my water is very similar lorax84's. Tap water is near 8.0 but I cannot get an accurate results for hardness (testing liquid is old).
Tank info: 2.5 gallons with 13 watts of fluorescent above. Heater is static @ 78 F. No filter. Pea gravel substrate on the bottom layered with approximately a half inch of sand on top. Jungle root tabs spaced throughout substrate for nutrients.