Typically, your salt mix is all the buffer you will need if it is a FO
or even a FOWLR
. When you start adding inverts (i.e. corals, clams, etc...) than you might have to start dosing.
A lot of people dose Kalk
which takes care of both Ca
. If one were still having a problem with low ALK
even when using Kalk
, then you could use a buffer to raise it.
Most people will not need a separate buffer when using Kalk
. Only those that have inverts that heavily drain Ca
will have a problem because the Kalk
can't keep up with the usage. These are going to be your heavily stocked SPS