Kevin

anybody have any info/advice on breeding jack dempseys?
i would like to breed them in my new tank...a 55-75 gal.

Chief_waterchanger

How wide from front to back is your tank, that can tell whether it is a 55 or 75. 55 = 1ft 75 = 18inches

Best way to breed most fish is to buy 6 or more young fish, let them grow up together and have the pairs form naturally. Then set whatever pair forms up in a tank by themselves with lots of hiding areas so if one or the other jack gets too aggressive there is a place for the other one to run to.

Do you already have the fish?

If you do already have just one pair try to set them up in a tank that has tons of stuff to break the line of sight, so that the dominate fish can't see the less dominate one. Fish are very vision oriented.