Seachem reef builder raises carbonate alkalinity without immediately impacting on phr with long term use there will be a tendency to stabilize at ph 83r carbonates and calcium are essential to all coral growth if either becomes deficient coral growth will cease followed by a rapid decline in coral healthr used as directed reef builder will not deplete calcium magnesium or strontium which usually tend to precipitate with increasing alkalinityr reef builder and reef buffer may be used t