Yes, easy to care for. Like any LPS or SPS you will want to keep your CA, Mag, & Alk at proper levels and nitrates and phoshates near 0. They are low to medium light and the same with flow from my experience. Too much light and their flesh will begin receeding. I think that is a great price. Hard to get a beer and a burger for $20 anymore.
Agree with others you will not find that size for $20.00 in many places. Lucky you get 4 or 5 mouths for $20.00. Also the colors are light in my opinion I bet it looks better when colored up properly. Each color should be very distinct.