Add females to my tank??

Bijou88

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Your mollies will likely get too big for a 20g, I would rehome them if you can. I probably wouldn't add any females with your current stock, you'd just get overrun with babies. I'd say without the mollies you're pretty well stocked imo.

 

DioAquatics

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Agreed with the above post. Your mollies will outgrow your tank pretty quickly. Adding females to the tank will only lead to an even bigger biolad in the tank and a quick overpopulation of fry, possibly cross breeds of guppies and mollies. If you rehome the mollies, your tank will be at a good stock count.
 

CindiL

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Speaking from experience, I currently have about 50 fry in a 10 gallon tank and they are mostly from my mollies. I thought I had all females but upon closer inspection found two males that I gave away since then. Luckily my locally owned pet store will take them once they're big enough.
 

chromedome52

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The most common molly is the black form of P. sphenops, which does not get too big for a 20 gallon tank. Sailfin species/hybrids will get much larger, and would be severely crowded. So the first question should have been, what kind of Mollies do you have?

The problem of livebearers having a lot of fry is another matter, and is a future concern. If one has all males it is not a problem, but as soon as you put a female livebearer in the tank, you will start getting babies in relatively short order.

I would be more concerned with the Tiger Barbs, as they need a lot more swimming room than any of the livebearers. If I placed 6 Tiger Barbs in a 20 gallon tank, that is the only fish I would have in there. And it would be a long 20, not a high 20.
 

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