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- Dec 13, 2018
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Light, undetectable phosphate from fish/fish food etc, nitrate, ammonia. our test kits arent perfect. A 0 on a test kit doesnt mean there is 0 of that nutrient in the water, but there is no way to attain an absolute 0. Gha can survive in super low nutrient environments once it has taken hold, and even as low as we can test, those nutrients are still available to organisms designed to absorb them. Basically vibrant bacteria out competes gha for those nutrients where additional macro algaes havent been able too in my tank. Had I never let my nutrients spike up and kept them low, I dont think I would have ever had this problem (as I didnt for years). Since I let nutrients spike for a prolonged period and didnt recognize gha for the huge inconvenience it could become, I probably could have killed it off by bringing the nutrients down hard. Unfortunately, I allowed it to grow thinking I could fix it easily, it took hold well, and then adapted as nutrients were slowly depleted.