Is It Alright To Keep All Males Or Females Mollies?

[beginner]

Hi Friends,
I was wondering if it was alright to keep all males or females mollies (with no other fish) to ensure they don't breed. Would this be fair on the mollies? It would be a well planted tank and I would add marine salt to it. Also, among mollies, which is most hardy and easy to keep for beginners.
Thanks & Bye

 

[Darkmoon Bettas]

Hi Friends,
I was wondering if it was alright to keep all males or females mollies (with no other fish) to ensure they don't breed. Would this be fair on the mollies? It would be a well planted tank and I would add marine salt to it. Also, among mollies, which is most hardy and easy to keep for beginners.
Thanks & Bye

If you want to guarantee no breeding, keep only males. Females you buy at the store are likely already pregnant and can have up to 6 or 8 batches of fry just from stored sperm. Male sailfin mollies are the most likely to fight with each other, I wouldn't recommend a tank of only male sailfins. Most other molly males seem to do OK together. Be careful with the salt if you're going with a planted tank, and I'd recommend "aquarium salt" over marine salt--marine salt has a lot of other minerals and things added to it that marine tanks need but freshwater and brackish tanks don' tatall

 

[babybell911]

be careful as male mollies can be quit aggressive too so get a big group so aggression can be spread out

 

[MHunt]

Am I right in thinking that the other fish would predate on the fry anyway? In that case there wouldn't be many survivors, and you wouldn't suffer too much from male aggression by keeping a group.

 

[dwarfgourami]

The most peaceful livebearer tanks are those with females only. I really don't think they suffer from this; tbh I doubt that female livebearers enjoy sex all that much, it seems a very macho affair (not like those sweet giggly corys!). The only drawback is, as mentioned, that each female may bring sperm from the store enough to last for several more pregnancies. Hopefully she will eat the fry, but there may be occasional survivors.
Males only , you are certainly safe from the fry problem, but have to deal with the aggression problem instead.
Up to you, really, which you think is easiest. But if you do go for males only, be sure to get a good-sized group- and some hiding places. Java fern will grow even in brackish water.