I think that with the amount and type of coral that you have, doing water changes alone should be just fine with keeping your levels in check. It's good that you are wanting to keep the coral happy and make it grow, but remember that this hobby is about patience, everything takes time. My personal opinion is that you are not ready to dose yet. I started to dose when I was noticing big changes in my water chemistry (calcium went from 400 to 300) in between tests and regular maintenence, I dosed because I needed to not because I wanted to. I'm just not seeing the need in your situation. I hope this helps you understand about dosing a little better. Don't be discouraged either, keep asking questions and learning.