Buy a bottle of cipro first to treat for bacterial infection if you get one. Get a 10gal tank, heater, light, pump for circulation and eggcrate to keep it away from the pump and enough water to do a 100% water change everyday For 7 days. I had one before and it looked perfect for 2 months and things went downhill fast. To set yourself up for success buy from someone that keeps them. There’s a guy on reef2reef that gets them in all the time along with a ton of other anemones and he treats them and keeps them for his collection, every now and then he sells one, but be ready to pay the price for a healthy one. A couple online retailers sell them but they don’t treat and your more than likely going to get an infected one. Wether you buy from someone or a retailer still buy the cipro to have on hand anyway. Can be kept in reef if on there own rock tower otherwise your risking losing corals since they will move and it’s usually up since they love light and lots of flow