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Coraline algea and its growth and color is a great sign os great water condition. What they say makes sence but rock placement and water movement and very pourus LR and Base rock can all conterreact this IMO. Besides i have read articals that say coraline in high enough amounts can be dangerous.
I get the feeling they are more concered if you depend on LR as the main or only source of nitrate and ammonia control. But i consider LR just another tool we use in water quality. There isnt any one method to control water quality.
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Lance H.
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