Phosphate is a compound of Phosphorus, it is also a primary nutrient source for many forms of algae.
Phosphates can be introduced into the tank by using, amongst other things, tap water, activated carbon,
KH buffers and some foods.
Ideally a phosphate test would give a result of less than 0.25 mg/l. You may have to use special products to reduce, by
absorption, phosphate to acceptable levels.
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