Animal Stories - Mollies

Animal-World Information about: Mollies

The Molly is colorful, active, peaceful and hardy--truly an aquarist's delight!
Latest Animal Stories
Sarah - 2004-03-13
I love mollies! If a fish can be lively and friendly... they are lively and friendly! They follow your finger on the glass and they are always doing something silly. We have 3 females and one male. The male is a dalmation sailfin molly, and 2 of the females are silver lyretails, and the last female is also silver, but shes a sailfin too. I havent seen any fry yet...maybe because I have danios and tetras, but Im going to look next time so I can net them! I recommend them to anyone!

Lindsey - 2013-02-06
My molly now is swimming wierd.It is like his spinal cord is croocked and he has been swimming verticaly latly. Doaes anyone know what is going on?

Click For Replies (1)
  • Lindsey - 2013-02-06
    wow i had a lot of typos, sorry
Lindsey - 2013-01-31
Recently my 20 gallon tank has had a fatal ich outbreak. I have taken care of the tank (disinfected), so that is ok. My only surviving fish was a dalmation molly. He is not currently in the 20 gallon tank but a quarantine tank (1.5 gal.), when I first put him in he did have some ich but it is now gone. My problem is now the molly has these rust coored spots on them. They are in his tail mainly but also on mouth and gill(?) area. I don't think it is some sort of infection though. They shimmer like it might be some new coloration.Does anyone know what it is?

Click For Replies (1)
  • Jeremy Roche - 2013-02-01
    Could just be the molly's color is changing.  environment can do that sometimes.
Dan Miller - 2013-01-06
My male silver sailfin molly is turning yellowish orange on his face (mostly around the nasal area). Why is this happening?

Click For Replies (1)
  • Jeremy Roche - 2013-01-06
    Mollies, especially the fancier varieties, have a lot of different colors in thier lineage. These genes can get expressed at different times in their lifetime.  Most mollys will have at least some discoloration, i.e. some yellow spots in a mostly black and white dalmation molly, or blue spots. Most likely some great great grandmother was a yellow guppy or something similar, and those genes just haven't been complelely bred.
Anonymous - 2012-12-31
i have one male molly in a community tank, is it okay if i add more males? i really don't want any babies. thank you!

Click For Replies (1)
  • Jeremy Roche - 2013-01-01
    Mollies will usually do just fine with multiple males.
Rob - 2012-11-30
I have 4 mollies in a tank and 2 of the 4 have almost like a hole in their gill coverings does anyone have any idea what they are? They act fine for the most part they still eat and all but IDK. :{

Click For Replies (1)
Anonymous - 2012-10-28
My mollies had babies.  Do I need to seperate them?

Click For Replies (1)
  • Jeremy Roche - 2012-10-28
    Yes.  They will eat their fry.  If you cant, put some breeding grass in to give the babies a place to hide.  You will loose some.
Cassara - 2012-02-23
About 3 months ago, my molly had a batch of about 25 fry. While sexing them today I found that I had no males. Are all mollies born female and then turn male later in life? Or is it just a batch where it was all females?

Click For Replies (2)
  • Clarice Brough - 2012-02-26
    Wow that's amazing, but not unheard of. It's believed that a number of influences can affect the sex of the offspring in fish. These include the age of the spawning adults as well as environment influences including temperature, pH, and light levels. There are a number of fish that will change sex, but Mollies aren't one of those.
  • Wythori - 2012-07-13
    Ignore last comment, I read it wrong. It takes about 6 months for the anal fin of the male molly to become the tell-tale gonopodium. Before it develops it will look like a female. Males will be slimmer and slightly smaller though.
Candice - 2012-04-01
I've got a 75 gallon tank with a lot of live bearers. About 20 fish in all. Recently while doing a water change I noticed some baby mollies so I caught them and moved them to a nursery tank. This was about 3 weeks ago. Later in the day after I finished the water change I noticed another baby swimming around a rock cave in the corner. Never could catch this swims too fast for me to grab with the net. Deciding that Nature would probably take its course I left the baby alone. Three weeks later, the babies in the nursery tank are quite large and resembling balloon bellied mollies. The baby left in the big tank is still quite small and seems to have escaped being eaten. Do I need to put more effort into catching this fish since it doesn't seem to be growing like its siblings?

If necessary to know, my fish are:
5 mollies (1m 4f)
5 balloon belly mollies (1m 4f)
4 platys (1m 3f)
7 guppies (2m 5f)

Click For Replies (1)
  • Jeremy Roche - 2012-04-02
    No real need. Remember the one with the big fish is more active so it is burning more calories and probably not getting spoiled with as much food since it is getting the big fishes leftovers.
Animal - 2012-03-31
If you buy female mollies from an aquarium with differing sexes, there is a strong chance that they become very suddenly pregnant, so be careful when buying females when there are males in the tank.