what are your expectations ? what are you trying to achieve from it ?
sponge power is a great additive, it feeds sponges, which in turn clean and polish water, and take up excessive bacteria, and in turn the sponge produces a "waste" which is consumed by SPS. it helps with purples too.
CV will bring out the true color of the tissue of the corals, great food for boosting growth as well.[use it within its life time though, it gets weaker as it ages]
Xtra is a mix of AA and other supplements, it has an amazing effect on darkening tissue, and at the same time give tissue a flourescent coloring. could say DEEPER coloring ...
AA is just amino acids, it darkens tissue color. increases polyp extension, I dose AA once in a WHILE since Xtra also contains AAs.
HTH, any specific questions or specific problem you are trying to correct, let us know
