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Is the algae able to derive carbon from the dissolved organic carbon (DOCs) in the aquarium water?
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No, only heterotrophs or mixotrophs can.
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why my algae continues to grow strongly but the alkalinity level remains at 125 ppm?
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Because CO2 dissolves into the water. Slowly. When a scrubber is growing too fast for this, alk is reduced.
Dosing alk can help the scrubber grow faster.
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Does an Algae Scrubber reduce Dissolved Organic Carbon
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Easy answer: No, they increase it, by putting into the water:
Vitamins:
Vitamin A
Vitamin E
Vitamin B6
Beta Carotene
Riboflavin
Thiamine
Biotin
Ascorbate (breaks chloramines into chlorine+ammonia)
N5-Methyltetrahydrofolate
Other tetrahydrofolate polyglutamates
Oxidized folate monoglutamates
Nicotinate
Pantothenate
Amino Acids:
Alanine
Aspartic acid
Leucine
Valine
Tyrosine
Phenylalanine
Methionine
Aspartate
Glutamate
Serine
Proline
Carbohydrates (sugars):
Galactose
Glucose
Maltose
Xylose
Misc:
Glycolic Acid
Citric Acid (breaks chloramines into chlorine+ammonia)
Nucleic Acid derivatives
Polypeptides
Proteins
Enzymes
Lipids