I switched my 210 over from a fowlr to a reef.
Reefs are more work but enjoy it alot more now.
I would start out with the easier corals 1st till you get the hang of it, like mushrooms, polyps, maybe some lps. I would stay away from sps until you get your hands wet!
T5's @ correct wattage will work for you but I am a personal fan of the metal halide shimmer! :joy:
research...research...research!!!
Not sure what your current setup is like but i would run a fuge, will need a good skimmer, good lighting, etc.
This is my setup just as an example.
210 display, 40 long fuge, 72" outer orbit hqi/t5 combo, 2 ss220 skimmers, stream pumps for added flow, 2400 gph main return, geo calcium reactor and i am sure i am forgetting stuff.
This place is a wealth of knowledge and the peep's are great!