Amazingly helpful post!Many lps coral are medium or low light, and medium or low flow.
For a beautiful easy coral that doesn’t have special needs, but should have stable calcium and alkalinity, I would recommend dragon soul favia. This is mine, I bought it as a single polyp for 40$ and when that polyp started spreading over the frag plug, I put the plug in a small 2.5” rock. When it spread over that rock, I placed on a 4” piece of shelf rock. It has grown nicely encrusting Rock to rock and makes it appear as a single piece. This whole process took 2 years to grow from single polyp to the below picture
Other good choices for beginners:
Duncan (left)
Palythoa grandis - something about a gigantic head paly group in a small tank makes it very interesting- these heads are each .75-1.5” each and unlike zoa you can feed them flake or mysis for faster growth
When you want to step up a little to something higher end and have stability proven, a single Cynarina can be an excellent centerpiece in a small tank. There’s lots of varieties and only need to be fed once a week, at night. These corals have become a favorite of mine due to their slow growth and unique variations
Torch is another of my favorites, they need good parameters, varying medium flow, and occasional feedings. Pick a small one because they do grow and stretch out
Eventually you can have a LPS garden they will have a variance of colors, textures, and motion
Clowns LOVE rubbing all up on corals that they decide to take up a home in, so be warned anything soft and fleshy with a fragile skeleton can be loved to death. I had a heliofungia that was doing amazing for a few months and then one day my clown decided he would make fish face skidmarks for hours at a time on it, and...good night sweet prince (the coral, not the fish lol)