Fish to put in a 75g?

I used to keep Malawi cichlids in a tank a little smaller than yours. Everything was fine at first, then the fighting began. There was always one poor fish hiding in the corner for his life. Sometimes they can chase a fish until they die of exhaustion. You remove the bully, then the next one takes over. When I was new at fishkeeping, I found a good fish store and became buds with the manager and got a mountain of information. I seek his advise to this day. I also bought many fish books and studied on line.

Good luck in your new adventure!

I now keep various types of rainbow fish and I have a peaceful tank and some of them can get quite large - see Boeseman's Rainbow.

There are other fish you can get that get quite large like the Irredescent shark or Bala shark. They can get up to 12". There are, of course, many other species that grow large, just do some research. If your hell-bent on Cichlids, then I recommend a tank with many rocks leading almost all the way to the top in the back, so everybody has their own space.

Personally, I'll never do the Cichlid thing again.

No guarantees when it comes to cichlids, especially if your JD is more than a few inches and gaining confidence and territoriality with each day, but I would recommend looking into Jewels and Severums; not large cichlids compared to ones likes Convicts. Some people do Firemouths as well, but this doesn't always work out well depending on the relative size and age of the animals.

You can put small sharks....