You plan looks good. You might see a small cylcle from die off. You never know. The only problem I see in your equation is your water source. You need to test that water, PUR water filters are great for drinking water, but your corals are more picky than we are. Do you have a TDS (total desolved solids) meter? If you don't you can get them on ebay for under $20. You should pick one up and make sure that water is suitable.