Slowly and you don't need to dose anything. Once your tank is half full add a kalk stirrer. After a couple of years and you want to scratch the high-end SPS itch, get a kalk reactor. Just do yourself a favor and don't dose anything! 5% water change twice a month is all your corals need. A light meter helps if you have LED. If you just do water changes and you are killing coral your lights that are too bright. The Bluetooth Apogee is your cheapest option. If it's not an Apogee it's a toy. Your LFS may rent them for $40 a day. The Bluetooth version is the same cost as 1 high end frag and it will last you a lifetime.