Our Complete Tank System is a simple and effective all-in-one solution designed to support vibrant coral growth, strong skeletal development, and overall tank health.This is a high pH version of Part 2 - Alkalinity, for the experienced hobbyist seeking to supercharge their coral growth. Part 2 is a simplified and effective all-in-one solution to adjust Alkalinity and pH, while adding critical trace elements. This product is intended to be used with part 1 of the system, but can be used separately as well. IDEAL ALKALINITY LEVELS Suggested tank alkalinity levels for our product is 7-8 degrees of carbonate hardness (dKH), and 8-9 dKH as the upper threshold.