The CA cichlids you mentioned look like plausible candidates for the tank. I wouldn't have any concern with some larger Plecostomus, would I?
I wouldn't be concerned at all
The CA cichlids you mentioned look like plausible candidates for the tank. I wouldn't have any concern with some larger Plecostomus, would I?
I wouldn't be concerned at all
They get pretty big, so ultimately you could probably only manage a pair or a single adult specimen in a 4x2x2 tank. Most problems with brasiliensis arise because of conspecific aggression, and crowding will exacerbate that. A small group initially would likely lead to one or more pairs forming, which in turn would change the aggression dynamic for (all) others in the tank. It's also worth noting that people vary widely in their experience with aggression in brasiliensis. Some report them to be unrelenting aggressors, and others find them to be quite passive. The species is really a species-complex, so that may factor into some of the variation. Plus, cichlids in general vary in personality and aggressiveness. If you are keen on having a group all you can do is try, and be willing to rehome if things get ugly.

Since braziliensus is from southern Brazil, although constant temp will not hurt them, normal temps would occasionally be a tad lower than the more Amazonian species.
I find braziliensus are less aggressive if kept at temps of high 60sF-to low 70sF.
Pairs I had would spawn in my ponds, where temps were only in the 60sF.
A pair of G iporangensis (braziliensis complex) spawned last year in an unheated room temp tank (@68'F).
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The LFS I work at also just got some Geophagus Norte in (still on quarantine), and I might look at getting some of them instead, as they stay around 7 inches and seem to do well in groups, as well as not being aggressive. Ill be doing a lot of research though.
The "Norte" you refer to are Gymnogeophagus, which are from Uruguay. These fish do best with a winter cool down period (low 60s). Having them in a tank with Royal Plecos would not be a good idea because the plecos requires consistently higher temperatures.
The "Norte" you refer to are Gymnogeophagus, which are from Uruguay. These fish do best with a winter cool down period (low 60s). Having them in a tank with Royal Plecos would not be a good idea because the plecos requires consistently higher temperatures.