Water changes I recommend on a regular basis, not when the tank is starting to look murky. After all things disolve in water, so when it gets to the point that you can see it..it's pretty darn bad.
I'd say a once a week water change would be nice, 10-15% but it depends on the fish of course. The optimal water changes depend on how your tank runs...only way to know is by testing. This isn't that hard since it's such a small tank, it takes me a couple minutes to do a water change on my 2.5 and 5 gallon. The fact they are near sinks is a bonus..the 2.5 being in the bathroom and the 5 gallon in the hallway just outside the kitchen.
Of course now your tank will test out nicely, you've done some pretty heavy maintenance recently. Usually test the water when there is a problem (or before to catch ahead of time)..of course I'm also thinking of the first two that died.
From a social point of view you may have some pretty sexually frustrated male guppies on your hands too LOL.
Aaaaanyways...
Temperature of the water is...what?
That and before you put guppies in the tank in the first place, how long did you leave the tank to cycle?
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