Water conditioners and other additives are a huge waste for the new reefer. The markup on a bottle of basically nothing is huge and the LFS pushes them for obvious reasons, it's where they make their real money.
Unless your pulling water from the Tar Sands I would not bother with conditioners. Buffers and additives are meant for established tanks. Dosing a new tank will only result in weird test results and in worse case crashed tanks.
And like everyone else has rightly said... Go slow.
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