The question of whether Jack Dempsey and Oscar fish can live together is one that many aquarists ask. The short answer is yes, they can coexist in the same aquarium - but with some important considerations. When it comes to tank mates, size matters; larger Oscars should not be kept with smaller species like Jack Dempseys as they may become aggressive or even attack them. Additionally, proper water parameters must be maintained and plenty of hiding places provided for both types of fish to ensure their well-being and reduce stress levels. Furthermore, if possible separate tanks should be used for each type of fish as Jack Dempseys are territorial by nature and will often try to assert dominance over other tank inhabitants if given the opportunity. Ultimately, it is up to the aquarist's discretion on whether or not these two species can peacefully coexist in the same tank - but when done properly there is no reason why an Oscar and a Jack Dempsey cannot live happily side by side!