You can dose the basic 3 which is MG/Ca/Kh. You can get them from bulk order as it's cheaper there. As for how much to dose, it's best to start at a lower dosage and with aid from your testkit you slowly tune the dosing pump according. Last of all if you dont know how to use the dosing pump after reading the manual try YouTube. For your FR you can use it for Rowaphos or carbon.