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Hard Water vs. Soft Water: Choosing the Right Filter for Your Fish
Fish are evolutionary products of their natural habitats. An African Cichlid from Lake Malawi needs "Liquid Rock"—water rich in minerals with a high pH. Conversely, a Discus or Neon Tetra from the Amazon thrives in "Soft" water that is slightly acidic.
The difference lies in GH (General Hardness) and KH (Carbonate Hardness).
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Hard Water contains high levels of calcium and magnesium.
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Soft Water has very little.
If you put a soft-water fish in hard water, it suffers from Osmotic Stress. The high mineral content outside its body forces its kidneys to work at maximum capacity to maintain internal balance, eventually leading to organ failure. When choosing a filtration system, you aren't just "cleaning" the water; you are balancing it. If your local tap water is naturally hard, you may need a Reverse Osmosis (RO) system to create a "blank slate" for your specific fish. This content was AI-generated, please review yourself.