Info On Jack Dempseys

No..they'll usually just order the salad.
 
They eat feeders, and their agression can vary dramatically from fish to fish.
Have you considered a blue dempsey? Not as robust, need VERY clean water, but nice colors (blue) and are better for a community tank.

Also, some say the BD is a hybrid. I choose to believe they are not.
 
i think im gonna move the gouramis and just make it a dempsey tank, and possibly a pleco..
 
For a 55, I would stick with no more than 2 JD. You absolutely MUST have space for them to establish a territory of their own. I think Id even pass on the pleco as you don't want the pleco barging in on them, not to mention the fact that a common pleco is just kinda blah and boring.
 
AquariaCentral.com