Man, a 180 is a great size tank. You could do a full size nasty Jag alone in that tank for life, and if you're lucky, you might even get him to tolerate a female in there with him. A pair of Jags with others -- I don't think so.
A single Jag in that tank with a few other species, if he grew up with some other fish, it MIGHT work out for life, might not--depends on the Jag. You'd just have to try it and see. All same sex would be your best bet.
Mi/Devil in that tank would fit size wise, but it could go nuts one day, too. Then it might not--you'd have to try. they're very much like a Jag in my opinion. I really think that full bred true Citrinellum, or Hoga's, or Amarillo's are a little less crazy than a Labiatus or a cross with a Labiatus. So If I tried an Amph with other fish in a 180, I'd do a Hoga, or an Amarillo.
But......if you were to maybe come off the Jag or Midevil idea, you could do some Vieja in that tank, thin them out as they grow real big, and end up with 3 maybe 4 big full size Vieja for life? That'd be MUCH more likely to work out in my opinion than a Jag or Midevil community thing. You may not like Vieja, or you just really want a Jag, I don't know. But at least consider it.
so in order of likelihood to really work out long term imho......
1. Single Wet Pet Jag, Midevil, or maybe a big Trimac--that'd work for sure.
2. 3-4 Vieja in that tank, no Jag or Amph--I think that'd be VERY likely to work long term.
3. Breeding pair of Jag's, Midevil, Trimac--you might lose the female, might not, but you'd at least end up with option 1 if you did lose the female.
4. Jag or Midevil in a community with some other big SA/CA cichlids. It COULD work, but something could very well just go psycho at 10-12 inches and you'd lose fish, or be dividing the tank up into 2-3 parts.
I think 3 and 4 are probably equally likely to work/not work.
Any of these options will really work, like @rajin_cajun said it's a great sized tank, so you can put almost whatever species of ca in there (almost all). It all up you you mate, you can either have a big old nasty wet pet (amph, or jag), a nasty breeding pair (any of the above stated) or a community which would be the hardest to work but possibly the coolest as many users will tell you that they often get bored of having just one 'wet pet'. It's really all up to you and what you want to do with because you have lots of options. Good luck!Great tank pickup.so many options.can you order fish online? Then you have many more to choose from,unless your LFS has good selection or can special order.I would stay with CA, oscar is SA.sometimes as fish grow up together they can seem good,then snap at maturity or because of rivalry for female.you might be able to do an all M or F tank.salvini, red devil,Freddie,RTM.....
I think the op wants an aggressive communityYour greatest chance of cichlid community success lies further south, in South America!
6-8 geophagus
1-2 severums
1-2 chocolate cichlids
Maybe some modest size cichlids like Festivum or Keyholes would work in there too.
In that case you'd almost hope to get at least a couple pairs in the Geo community... They're so much more chill you could have multiple pairs spawning at the same time and the rest of the fish would be fine.
This has the highest chance of working in my opinion. You could get away with an Oscar instead of a chocolate I bet too.Your greatest chance of cichlid community success lies further south, in South America!
6-8 geophagus
1-2 severums
1-2 chocolate cichlids
Maybe some modest size cichlids like Festivum or Keyholes would work in there too.
In that case you'd almost hope to get at least a couple pairs in the Geo community... They're so much more chill you could have multiple pairs spawning at the same time and the rest of the fish would be fine.