Is the level of phosphates (PO4) in your aquarium water something you should be concerned about? The answer is that phosphates aren't a direct killer of fish, but they do cause problems in the aquarium. At the very least, you should know what your phosphate level, then test every month or two and record the results to monitor trends.Why test at all if phosphate is not lethal to fish? Because over time phosphate levels can rise enough to contribute to algae growth. Phosphates come from many sources, including uneaten fish food and sometimes even water additives. Here is how to avoid phosphates, and reduce them if they get too high.
More About Phosphates
Phosphate Testing Video
Water Test Kits
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