I am very new to fish keeping. I believe i have a female dalmatian lyre tail mollie, but i really want to be sure.

Additional information. I had 2 plattys, 2 dalmatian mollies and 2 black mollies. In the course of 4 days I lost both black mollies, one dalmatian molly, and have 13 baby fish. I'm thinking mollies.

Lisahcan said:

Additional information. I had 2 plattys, 2 dalmatian mollies and 2 black mollies. In the course of 4 days I lost both black mollies, one dalmatian molly, and have 13 baby fish. I'm thinking mollies.

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What are your water parameters (ammonia, nitrites, ect)
How often do you do water changes and how much do you change?
How long did you have the fish before they died?

The fish in the picture is a female molly, and it is a dalmation (black & white spotty pattern) and it has the lyretail.

Female mollies, platies, swordtails & guppies have a fan or triangle shaped anal (bottom) fin.

Male mollies, platies, swordtails & guppies have a long thing anal fin called a gonopodium.

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Common livebearers like guppies, platies and swordtails need a pH above 7.0 and a GH (general hardness) around 200ppm.

Mollies need a pH above 7.0 and a GH above 250ppm.

If the water is too soft (lacking minerals), they have problems.
If the pH is below 7.0, they can have problems.

If the fish look off colour or one dies, do a 75% water change and gravel clean the substrate every day for a week. And post some pictures here along with information about the tank.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

The following link has information about what to do if your fish get sick. It's long and boring but worth a read when you have some spare time.

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What sort of filter is in/ on the tank?
Did the shop tell you how to clean the filter?

Did the shop tell you about the filter cycle?
Did the shop tell you about water changes and feeding?