Hi, I'm setting up a 75 gallon aquarium with a Jack Dempsey as my main fish. I would prefer two, one male and one female, along with some Cory and Ottos as a cleanup crew. I would also like to add a minimum of six schooling fish that a nice to look at can hold their own in this aquarium. Any ideas? Also, will two JD's be overkill? Filtration and water quality will not be an issue. I'm just worried about space.