Hi
Would suggest you seek out some of the more marine centered websites.?? Not much info here as it's usually pretty dead lol.
When i ran marine I used collected seawater but when I did have to make it I always used RO water as a base.
I'd find a good reliable source for Ro water since you will always need more for water changes anyway.
From your readings sounds like it's cycling about norm.
. There is always some die off from live rock and "ALGAE is an eternal problem lol Good luck wirth your new tank.
gary

HEY! no need to move on to another channel, yes marine aquariums need to use RO water due to the dissolved nutrients in tap water, also heavy metals. you can use distilled water from local grocery stores. distilled water and RO water are acidic so you must ammend each gallon with RO right to bring to sea levels of cations. post more please, I love helping out with marine tanks, esp coral setups.