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Betta fish - just make sure to give them a few gallons of water in which to swim, a filter for their poo and a heater in their tank to keep them comfortable year round.
It's mostly only the males that don't get along with each other. Given enough space, females can be peacefully kept together in sorority tanks. Similarly, a trio or harem (i.e. one male with multiple females) is typically safe as well and the fish get along just fine, given a large enough tank and appropriate stocking.
Also, most reputable breeders and sources of information will tell you that 5 gallons / 19 liters is the minimum suggested tank size for a happy and healthy fish in optimal conditions. While they can certainly survive in much smaller bodies of water, it's not ideal and in some cases it's actually harmful.
Sure but females wants a strong male, and strong (animal) males fight other males.
If you would have only females, the entire fish species dies out. Nature needs strong fighters to protect things.
Just thought I'd mention that there are species of fish and other animal groups that are all female or close enough to it that their populations do not rely on males to propagate. For example, Amazon mollies. I couldn't tell you if any species of betta are capable of parthenogensis, but as a general statement "If you would have only females, the entire fish species dies out" isn't universally true.
Although it's possible that female bettas want strong males, I'm certainly not a female betta and don't want to get too far into the territory of anthropomorhpism and there are certainly other possible motivations and processes going on than simply wanting "strong males".
But really, all this seems to be veering oddly away from the original topic and my first comment, so I'm just going to leave it at that.
Of course. Never intended my comment to be a book on the subject. :)
Sexual selection is different than what is "needed" by a species. Males who are able to fight off others and therefore are the exclusive mates of a large group of females will propagate the genes that reinforce their physical prowess and aggressive behavior.
This also benefits the females if they will have sons who are more likely to win their own harems.
But there are also competing strategies. Sneaky males who can mate with another male's group without fighting him off will also propagate their genes. Females in the group benefit if they will have sneaky male offspring who will be similarly successful.
"Strong" is not the default for "most likely to have offspring." There are many strategies, including monogamous species which invest together in their offspring. Evolutionary psychology can get oversimplified and misapplied, especially by beta males whose mothers hurt their feelings and now lash out at women whenever they get the chance. That last bit was an attempt at irony, btw.
Yeah that's true. I was just describing the basics to not have to write that entire thing you just wrote. :)
I can't read your mind, but it seemed like you might be making a generalization about fish that you might think applies more broadly. But I can't know that, so if you say you have a more nuanced view but didn't want to spell it all out, that certainly could be the case.
I mean, yeah, I assume most people don't say everything they know about a topic. It would be exhausting to listen to.
What you wrote is something I think everyone learns in school also.