how big is the JD? and make sure the polypterus senegalus has some where to hide like a PVC tube which u can get at lowes.markoi;4369453; said:i dont have the tank setup because i need to make space in my home. I only have the jack dempsey in a 55g. All the fish will be bought at roughly the same size. Maybe around 1-1.5inch. I can use spare rocks from my mbuna tank to create caves. Also ill use driftwood to aid in the abundance of caves in the tank.