I use Coralife salt. I do not use additives on a regular basis, just rely on 15 gal
. water changes every two or three weeks. I was at the LFS
a few weeks ago and the SeaChem rep was there. We got to talking and I told him I did not see the need to dose any additives in my tank. He disagreed, of course, and gave me a Reef Pack to try for free (and a t-shrit!) I used it for about a month and did not see any significant difference in ALK
, Ph. I did, however, notice a remarkable increase in my xenia growth. It has always grown well, but when I was dosing it took off and went crazy. The stalks became very think and it really started to spread. I still do not know if it is worth the $$. If you are one that slacks on wter changes then maybe.