Reply. Hello Debbie. We're glad to know that you are changing 20% of the water twice a week, and your aquarium is better with no more odor. That
is very important for the health of your fish.
I presume that you bought your female guppy and two female mollies, and here is what probably happened to them, before you bought them.
They were born and raised in a big pond on a fish farm somewhere. Then caught in a net or in a so-called fish trap that is a screened container with a one way entrance.
Something like a lobster trap that you may have seen, but usually with a finer screen, because your fish are smaller than a lobster.
Next your fish were probably conditioned in a big vat on the fish farm, then caught with hand-nets and put into boxes to be shipped hundreds of miles away to a tropical fish
wholesaler somewhere near you.
Then the wholesaler sold them to a retail fish store, who put them in their aquariums, where you bought them, and took them home to your aquarium. All of this was probably
pretty stressful for your fish.
Of course the fish farmers, and the fish wholesalers, and the fish store all try hard to reduce the stress, because it is their business to sell healthy fish. But it is still a
stressful being caught in nets and shipped in bags. Especially when you are a pregnant fish.
Often when you raise up the babies in your aquarium, those that are females will have less problems, and not die when they have babies, because they have not gone through the stress of being
caught and shipped. They have lived their whole lives in your aquarium.
Good luck with your fish.