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What is your proportion of male/female for the guppies... I believe two "sucker" is a lot for a 30g tank.. Did you test your water ? It might be contaminated.. There is a lot to look at..
Need to ensure the males aren't over-active with the females. You need proper ratio of male:female. Also check to make sure she's pregnant/not. Is this an established tank? How long have you had her/them?