guppy question

[pandafishowner]

The tank was cycled for over a month without any fish before the first 3 guppies were put in. The temp is always around 78 degrees. It takes about 3 days for the water to start getting a bit murky, so water changes are at least once a week, usually 2 or 3 though. I'd get a female, but I don't want a lot of guppie babies on my hands, they multiply worse than rabbits Today the tests still show no amonia and all other levels are good. Darn guppies, supposed to be easy fish and I've had nothing but issues. lol