In that tank... in additions to zoos and gsp, you will likely do well with acans and all kinds of other low light LPS corals. Though... there are so many varieties of zooanthids you could get lost just collecting variations of that type of coral.
Corals arent hard. Just test your alk and Ca from time to time. The rest you already know. Start with softies and LPS and you will be hooked.
For small fish it might be fun to do a pistol shrimp and Shrimp goby. I got a tail spot blenny but they are really tiny. I was surprised at how small it is when i saw it. But they are fun too.
FYI your tank is around the size of mine and i just ordered a tri colored fairy wrasse. it will get to me on tuesday and will let you know how it goes. I think that would be a good fish for your setup