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I bought the one on the right because I thought my female was pregnant, hoping they would breed. But they haven't bred yet. What could be the problem? Don't tell me that I bought another female from the store *facepalm*.
Females will be larger and also wider at the abdominal area than males. Males are shorter and thinner. Best way I know of to sex them is by looking down on them from above. The differences are pretty clear. Hope this helps.