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i have used drop after drop in a tank where there were babies and pregnant fish, and none of the fish that were pregnant had babies, so i can only assume it was the growth hormone. i hadnt put anything else in the tank.

it does tell you to be 'careful not to use too much' when you purchase it. i try to heed that warning now!!

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Are you sure that you don't have to many fish in your tank (Your only allowed 21) and thats why your not seeing babies?