Mollies pregnancy

[TO KYO]

Ever since I moved my mollies from a 37g breeder tank to a 55g tank my female mollies won’t drop any babies no more. At first I thought maybe because it’s winter time, but now I doubt if it is the season or not?? And yes, my males are breeding with them. None are getting pregnant.

 

[Colin_T]

Can you post pictures of them?

If they are fat and have been for several months, they could have a bad case of intestinal worms.

If they are skinny and not getting fat, they could also have worms but not as many.

Cooler water can slow the gestation period but unless the water temperature is cold, it's not going to slow it down that much.

 

[TO KYO]

I don’t see any signs of worms. My temperature is at 79-81. The last time I got frys I think it was summer 2019

 

[Colin_T]

As long as the water temperature is above 24C (75F), they will breed.

You have a couple of gold females that look fat. If they have been like that for several months then they probably have intestinal worms. You can't always see the worms and fish can have them for years and remain reasonably healthy. They just don't breed.

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You have too many male mollies in the tank.

One of the silver males and a gold marble male (at the bottom of the pictures) look a bit skinny and could have gill flukes, or they could just be getting bullied really badly.

Too many males will stress the females and can hinder breeding.

Livebearers are best kept in a single sex tank with all males or all females. When you want to breed them, move a male and female into a spare tank and leave them together for a week, then move them back into their own tanks.

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If you haven't dewormed the fish in the last few months, I would start with that.

You can use Praziquantel to treat tapeworm and gill flukes. And Levamisole to treat thread/ round worms. If you can't find these medications, look for Flubendazole, which treats both lots of worms.

Remove carbon from filters before treatment and increase aeration/ surface turbulence to maximise oxygen levels in the water.

You treat the fish once a week for 4 weeks. The first treatment will kill any worms in the fish. The second, third and forth treatments kill any baby worms that hatch from eggs inside the fish's digestive tract.

Treat every fish tank in the house at the same time to prevent cross contamination.
You do a 75% water change and complete gravel clean 24-48 hours after treatment. Clean the filter 24 hours after treatment too.

Do not use the 2 medications together. If you want to treat both medications in a short space of time, use Praziquantel on day one. Do a 75% water change and gravel clean the substrate on day 2 & 3. Treat the tank with Levamisole on day 4 and do a 75% water change and gravel clean on day 5, 6 & 7 and then start with Praziquantel again on day 8.

The water changes will remove most of the medication so you don't overdose the fish the next time you treat them. The gravel cleaning will suck out any worms and eggs that have been expelled by the fish. Repeating the treatment for 3-4 doses at weekly intervals will kill any worms that hatch from eggs. At the end of the treatment you will have healthier fish.

 

[TO KYO]

As long as the water temperature is above 24C (75F), they will breed.

You have a couple of gold females that look fat. If they have been like that for several months then they probably have intestinal worms. You can't always see the worms and fish can have them for years and remain reasonably healthy. They just don't breed.

------------------
You have too many male mollies in the tank.

One of the silver males and a gold marble male (at the bottom of the pictures) look a bit skinny and could have gill flukes, or they could just be getting bullied really badly.

Too many males will stress the females and can hinder breeding.

Livebearers are best kept in a single sex tank with all males or all females. When you want to breed them, move a male and female into a spare tank and leave them together for a week, then move them back into their own tanks.

------------------
If you haven't dewormed the fish in the last few months, I would start with that.

You can use Praziquantel to treat tapeworm and gill flukes. And Levamisole to treat thread/ round worms. If you can't find these medications, look for Flubendazole, which treats both lots of worms.

Remove carbon from filters before treatment and increase aeration/ surface turbulence to maximise oxygen levels in the water.

You treat the fish once a week for 4 weeks. The first treatment will kill any worms in the fish. The second, third and forth treatments kill any baby worms that hatch from eggs inside the fish's digestive tract.

Treat every fish tank in the house at the same time to prevent cross contamination.
You do a 75% water change and complete gravel clean 24-48 hours after treatment. Clean the filter 24 hours after treatment too.

Do not use the 2 medications together. If you want to treat both medications in a short space of time, use Praziquantel on day one. Do a 75% water change and gravel clean the substrate on day 2 & 3. Treat the tank with Levamisole on day 4 and do a 75% water change and gravel clean on day 5, 6 & 7 and then start with Praziquantel again on day 8.

The water changes will remove most of the medication so you don't overdose the fish the next time you treat them. The gravel cleaning will suck out any worms and eggs that have been expelled by the fish. Repeating the treatment for 3-4 doses at weekly intervals will kill any worms that hatch from eggs. At the end of the treatment you will have healthier fish.

Yea. I have a 75 gallon set to go, but I need to build a double stand for my 55 and 75. And yes the one green Molly is getting bulky by the adult green Molly that’s why I bought a 75g so I could separate them. Although I have no idea what measurements I’ll need yet. If any of you have a good model hit me up mate.