I think you will find it difficult as all corals eventually grow. I believe the suggestion of islands is probably the best thing to test out if you want 'test' a coral.
GSP, pulsing zenia, firework clove polyp, zoas, mushrooms.. the list is endless.
They best thing to do is have your coral separate to begin with, ensure it can survive, and also if you like the look of of it.. it may look great on a photo under filters but you may not like it in your aquarium, some corals look like a purple mess in daylight, then flourish at night under blues (when your in bed).
My suggestion is to research as much as possible, see which corals you get attracted to, screenshot all, then research more if it's compatible with your aquarium

Then adjust from there, I hope this helps

Patience is key to success