I have a 4" female jaguar and a 6" male jack dempsey. I think they are showing signs of breeding but they never go for it. Like the dempsey will make a nest and the two will sit there for awhile and defend it but then the next day it's gone and the fish are swimming around on their own. but then the next they will have a nest in a different area and it starts all over. the current tank they are in is 180 gallons w/ a gar, clown knife, and ornate bichir. I really want them to spawn. How can i make it happen? I have a 75 that i could clear out for them. would that help if they were in their own tank?