hey guys i have a 5 gallon reservoir of fresh RO water that i use for my ATO. i need to start using kalk all my corals aren't happy i think its because my calcium is to low last time i checked it was 200 which is obv really low. so i finally have some money and a day off so i am going to go to the store today to buy some kalk. my question is how many tea spoons should i put in my bucket, i obviously want to start off slow not to shock the system. any tips and things i should look out for that way i don't screw this up lol?