Agree with above... Test kits are a must have before using any additives, NEVER add anything unless you test for it first.
I only use bionic 2 part alk
and cal additive, thats it... Tanks been running great for over 3 years, check out my pics and you will see that my coral and colaline algae growth is good.
Also it depends on what type of tank your going to have... Reef, fowlr
, soft or hard corals??
So if the LFS
is telling you you need this or that without asking you any questions, don't buy it.
Can't say enough that regular water changes are a must.