Pregnant pineapple swordtail

Feb 9, 2018
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I bought 2 female pineapple swordtails in the shop today and I looked into the tank to check and noticed one was pregnant. I have 3 angel fish, 2 pot belly mollies and 3 penguin striped minos in the tank also. I'm not sure how long she's been pregnant and I'm not sure how to look after her properly and to stop a miscarriage.