There's not a lot they won't get along with, it depends on what kind u get, as long as the the other fish are less aggressive.
I have a stars and stripes puffer with a coral beauty, 6 line wrasse 2 bangaii cardinals and a yellow watchman everyone gets along fine but my puffer is definitely in charge.
now corals and other inverts thats another story. My blue legged hermits escape being harrassed and so do my turbo snails but I'm too afraid to try shrimp or anemones/corals.
For a 75 gal
tank ur gonna want to get one of the smaller puffers. Something that only get about 4 inches. A lot of the larger puffers, such as porcupine puffers, can get a foot or more and really require a 100gal tank or up.
Liveaquaria.com is pretty good at giving ideas on sizes and requirements. Also check out http://www.thepufferforum.com/forum/...rPedia/Marine/
. It will give u pretty much all the info u could ask for.
Also if u see a puffer in your lfs
double the what Kind it is before u get it bc a lot of them are mislabeled. That's what happened with me. My stars and stripes really needs a 180 gal
tank when he's full grown. So I'm gonna have to take him back.