Don't forget a check valve that will stop water from siphoning out from the tank when the co2 stops (as a preventative). pH and KH test kits will be your best friends as long as you aren't using any other buffers that drop your pH.
I am concerned about crushed coral being necessary as long as you maintain a stable slightly acidic pH (6.6 - 6.
but the calcium carbonate released by acidifying crushed coral could possibly increase your general hardness as well. Keeping a stable KH of at least 3dKH with 10-25% weekly water changes and testing to maintain this balance as well as adding other macronutrients (stressing potassium levels) assuming you are using tap water and keeping sufficient iron levels in the substrate will help as well. Depending on what kind of water you will be using (how the general hardness and carbonate hardness tests out can alter these reccommendations)
Reverse Osmosis water plus Seachems Equilibrium to boost GH provides a healthy amount of potassium and Seachems Alkaline and Acid buffers can be used 2:1 respectively with pH testing to determine the amount of dissolved CO2 in the tank.
CO2 fertilization will increase the usage of macro (N,P,K, C) and micronutrients (Fe, Cu, Mg, Zn, Br, Na, S, and Mn). Being aware of this will help avoid nuisance algae before it starts!