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| Saltwater fish and nonvertebrate organisms, as well as fish like cichlid that inhabit waters such as Lake Malawi and Lake Tanganyika, are suited to slightly alkaline, somewhat hard water, and in many cases, coral sand is used for breeding. Coral sand does enable significant raising of the pH level, but its main component, calcium carbonate (calcite crystal), is high in chemical stability, leading to a decrease in calcium release after approximately half a year, in turn making it easy for the pH level to drop. The main component of Power House Hard Type is calcium silicate (wollastonite crystal), and it isn't as high at first in inherent pH as coral sand, but it maintains the power to control the drop in pH level over the long term, making for a breeding-suited environment of such fish. |
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