Hi --
I've followed the advice I've gotten and things have really changed in my tank. I've done all the little water changes so the tank should pretty much be only my well water at this point. I've added nothing - no pH anything, no algaecide, no nothing. I got my liquid test kits and here are the results now: the pH is up to 8.2, ammonia is zero, nitrites are zero, nitrates are 5.0, GH is around 53.7 and KH is 125.3. According to the information with the test kits, my tetras should be in trouble (test kit literature says they like acidity), but they're absolutely fine. Then again, you've all said pH levels aren't so important so long as they're stable - or that's what some of you have said. I mean to say that the general consensus is that pH levels aren't the only important factor.
I'd still like to get some guppies, but I don't want to commit fishocide. (And to respond to Jennifer C. - I never got females because I didn't want to get into breeding. I had guppies as a kid, and they had babies like crazy, but it was also a 20 gallon tank and my current tank is only 10 gallons.)
So - any thoughts on how the current environment in my tank might affect over-bred male guppies? Or any recommendations on other small fish that would do well in my well water?
Thanks again for everyone's responses!
akg