I've only had spectabiles since October 23rd. I got six of them, about 3-3.5inches. They are all pretty close in size. It's still kind of hard to judge how aggressive they are. The only other fish I have in there is a Paratilapia polleni who is just slightly larger than the spectabiles. The polleni was already in there. He was weary of the new arrivals at first. That was likely because his last encounter with a new species to the tank (Hemichromis fremongi) didn't go so well for him. Don't worry, that frempongi was moved to another aquarium long before I got the spectabiles.
But the polleni is gaining confidence and chasing the spectabiles more and more. Nothing major, it's always like a 1-2 second chase.The aggression is spread out because all 6 of the spectabiles are food hounds and stay out in the open looking for food and begging. The polleni is also a major food hound, and less finicky than the spectabiles to boot. He seems to like the frozen brine shrimp a lot more than the spectabiles. Some of the spectabiles don't seem to mind the brine, others turn their noses up to it. But the polleni keeps on chowing down on it until every little shrimp is gone. Last week I accidently left my bag of assorted frozen fish food out for a day, so all I have left is the brine shrimp I had kept seperately because it came in a larger package. When I get a chance to hit a LFS I'll have to get more frozen krill and mysis. Maybe the spectabiles will eat meatier food more enthusiasticaly.
In the short time that I've had the spectabiles (less than two weeks)I've noticed that the polleni has increased his size advantage over the spectabiles. I was hoping to keep these fish together through the winter, but I may have to move the polleni to a different aquarium sooner than I hoped. It's still all good for now, I'll keep my eye on things.
I've done a lot of research on the internet to find more information on spectabiles. Not a ton of info, but some. They can be very aggressive with their own species, and to others in their genus. When younger, groups can be maintained with less aggression than if you only have 2 or 3. I read this on a forum somewhere. Mine do show aggression towards each other, but so far nothing out of the normal "typical cichlid behavior". I know the aggression will be raised as they grow and mature, but I'm just looking to get a pair and find homes for the rest of them.
I think these are cool cichlids that display aggressive and predatory behavior that draws so many people to keep cichlids. But I don't they are equipped to battle with equal sized badboys like trimacs, buttikoferis, jags, mayans, red devils etc.