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Breeding Mollies

I had 20 mollies in a 50 gallon tank. Both male and female. I want to breed them. I have black, orange, Dalmatian and silver. Five of them have died mostly male and one female. The only ones that have died if either been silver or Dalmatian. The black mollies are larger then the rest. I read in a previous post that male Molly is full fight it looks like the female Molly that just passed away was attacked by the other fish. They have made it some but I've only seen three or four babies. It is my tank too small for 20 mollies to breed or should I be doing something different? I'm trying to breed fish as a hobby and possibly a way to make money but it's more of a hobby. Any advice would be helpful. I'm a beginner. They eat a lot so I might be over feeding them I'm not sure..
1 ACCEPTED SOLUTION

Accepted Solutions
Community Representative

Re: Breeding Mollies

Hi, AnitaSammichWe reached out to our animal care specialist and they advised the following. The standard for a freshwater tank is 1” of adult fish per gallon of water making a 50-gallon a bit too small for 20 adult mollies (2” - 4” depending on species), plus babies. The diet should be varied but only feed what can be eaten in 1-2 minutes. Here are some questions to think about:  
 
Have you checked water quality? 
Have you checked water quality? 
Are you adding freshwater salt to your tank?
What is the temperature in your tank?
How much breeding gare grass/hiding places available for the babies?
Are you using breeding boxes?
 
As a side note, water samples can be brought to Petco and tested for free along with a consultation from our aquatic specialists in that location. They can also offer some advice. Thank you.
 
-Tiffany W.
3 REPLIES
Community Representative

Re: Breeding Mollies

Hi, AnitaSammichWe reached out to our animal care specialist and they advised the following. The standard for a freshwater tank is 1” of adult fish per gallon of water making a 50-gallon a bit too small for 20 adult mollies (2” - 4” depending on species), plus babies. The diet should be varied but only feed what can be eaten in 1-2 minutes. Here are some questions to think about:  
 
Have you checked water quality? 
Have you checked water quality? 
Are you adding freshwater salt to your tank?
What is the temperature in your tank?
How much breeding gare grass/hiding places available for the babies?
Are you using breeding boxes?
 
As a side note, water samples can be brought to Petco and tested for free along with a consultation from our aquatic specialists in that location. They can also offer some advice. Thank you.
 
-Tiffany W.
Occasional Contributor

Re: Breeding Mollies

Did you cycle the tank? Seems odd you lost so many fish.

Also make sure you have tons of plants (I'd recommend moss as they grow in any condition) and decorations - this is so the babies have a chance of survival.

Also how is your tank setup? You running a heater? I know temperature is a factor in breeding.

Is your filter intake covered with a pre-filter? It'll keep from babies being sucked into your filter.
New Contributor

Re: Breeding Mollies

I had a breeding net but catching the females was very difficult. The babies have several places to hide but I'll look into getting a box. I should get the water tested so that could be one issue. Too many males could be another problem. So far only males have died from what looks like physical injuries to the mouth and tale. My black mollies are bigger then the others so I think they might be responsible for the other males dying.
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