Required tank size

[Al KW Tan]

I see quite a bit of chasing and some shredded tails even just in that short video of the tank, severum looks pretty torn up. That guy may also have gone through many fish which didn't make it before finding a mix that worked out OK, and with these big cichlids it can all change over night.
It is certainly possible to keep "non advisable" mixes, or keep more densely stocked tanks than most would recommend. Years ago it was the norm, I remember having a 90 gallon which was overstocked and a 125 full of big bruisers. The thing is, I lost some fish that I shouldn't have because of it. Biggest Lyonsi I have ever seen straight from jeff rapps, got absolutely shredded one night after everything being fine for a while. Just for one example, I'm sure I lost more over the years. Which is why I am much more conservative when giving advice for these big fish nowadays.

I see a video of some slightly torn tails in an otw relatively compatible mix. Yet, I get what you mean. This fella below decided to turn into a vicious killer overnight, after living peacefully (sort of) with larger cichlids for months.

 

[FINWIN]

Not true. They are more aggressive when they lay eggs without any male jag cichlid present.

This. People need to leave the anthromorphic sexism at the door.

 

[Al KW Tan]

I see a video of some slightly torn tails in an otw relatively compatible mix. Yet, I get what you mean. This fella below decided to turn into a vicious killer overnight, after living peacefully (sort of) with larger cichlids for months.

View attachment 1433315

 

[RedTerror525]

I had to separate a jag and a flowerhorn in a 120 setup I had.. worked for awhile but aggression got out of control eventually

 

[duanes]

View attachment 1433757

This fella above looks like a female to me.
On average, in nature once a cichlid the size of a normal Parachromis hits maturity it will defend a territorial area of about 250 gallons.
I've watched 10" JDs in the Cenotes of Mexico defend square areas of at least that size from any other cichlid interloper.
Many immature cichlids will go for months in a 6 ft community tank, but once that instinctual maturity sets in, a normal 6 foot tank is much too tiny for any more than a compatible pair.

 

[Al KW Tan]

This fella above looks like a female to me.
On average, in nature once a cichlid the size of a normal Parachromis hits maturity it will defend a territorial area of about 250 gallons.
I've watched 10" JDs in the Cenotes of Mexico defend square areas of at least that size from any other cichlid interloper.
Many immature cichlids will go for months in a 6 ft community tank, but once that instinctual maturity sets in, a normal 6 foot tank is much too tiny for any more than a compatible pair.

Wow, that must be one super territorial and aggressive cichlid. A male, I suppose. Thanks for the informative comments.
I guess.. In my case it's to each his/her own tank

 

[Al KW Tan]

I had to separate a jag and a flowerhorn in a 120 setup I had.. worked for awhile but aggression got out of control eventually

Since it is actually pointless to have them together unless I want them to interbreed, I guess I got to get them each individual tanks. Saves a lot of space, time and headache.

 

[Al KW Tan]

View attachment 1433757

She's quite a docile fish over 3 months ago

 

[Rass]

I would separate all of these species

 

[Al KW Tan]

Must be lonely..