IMO a 75 gallon is not an ideal size for a Jag, female or male because of both size and behavior. If you want to keep them with tankmates, a larger aquarium is even more important. Some members tend to think that female Jags will stay small but they can grow larger than 8 or 10 inches. With limited tank space or options, it's always much better to stock with cichlids of the appropriate size and numbers. Trying to make larger, aggressive species work in smaller confines without the sincere intent of upgrading is a poor way to keep cichlids IMO.