Number of Severums in a 90 gallon?

It really depends on the individual fish. If you were lucky enough to get all females, you could probably keep 2 or 3 comfortably. I've had males that would harass any other male in the tank, even when I moved them to a 6 foot tank.More than likely, if you start with a group of 6, you'll end up with a pair.

I had a 10-12" male green severum and 10" red spot atabapo and they relentlessly chased each other around a 265g. Only saving grace was a ton of hiding places

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I'd just aim for a pair, and hopefully a small pair. A large male will still harass a female in that size tank if he wants to spawn and she's not in the mood. Sometimes you find males who will get along well if raised together, but that will also depend on space. I've had fish beat the crap out of each other in a 75 gallon tank only to leave each other alone in a 150.

I would suggest only 2 in 90g. I have 3 in a 6ft 125, they play nice even with 2 males, but the tank footprint plays a role in the peace.

^ It's both. Cichlids will tend to be more aggressive toward each other in smaller spaces where their territories may overlap. The more room you give them, the more settled and passive they tend to be. My 3" Aequidens growouts were starting to really do a number on each other in a 55 growout, so I moved them to a 150 and now they ignore each other. Severums are very similar in that regard.

The likelihood of two adult severums of the same sex getting along is a toss-up in a tank that size. It may work out great or it may not. Chances are, if they are tolerating each other at 4" or so, they'll be okay. But always be prepared for that to fail. Even with a bonded, mated pair, the two fish will sometimes squabble or even turn on each other if there's a disagreement. I've had it happen more than once with severums. It's why I don't even keep breeding pairs alone in their own tanks anymore. Having said that, a mated pair will probably be more likely to live long-term in a tank that size if given sturdy dithers to distract them and give them something to channel their energy and aggression into during spawning mode.

double post

It all depends on the fishs attitude. Ive had rwd spot male in a 90gal for 2 years woth several other fish. I bought and added a new male red spot about a week ago. He was chased and picked on for 2 days by my established male SEV and my EBJD.. after 2 days they are all completely ok with each other. No aggression. Soo ithink its more the idividual fish then the tank size. Because i habe quite a few fish in my 90. Which is really overstocked and aggresuin is almost non existant in my tank

I think if you buy them all small and let them grow together they will tolerate each other much better when they are full grown