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So the question is, how many of you don't use it, but what I really like to know is why don't you?
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I don't use it and never have. My water perimeters are great. Instead of GFO i just use chemi pure elite and 20% water changes a week.
Could the reason for needing GFO come down to bad husbandry… Over feeding, needing to clean the skimmer cup more often, more organic (rot) breakdown not being removed, etc.?


You need some way to export phosphate. There are a variety of ways and GFO is just one of them.
But using it doesn't mean the husbandry is bad any more than it means that if you use macroalgae growth, an ATS, or bacterial growth to deplete phosphate.
There is a lot of phosphate excreted directly from fish, and so skimming (which does not remove inorganic phosphate) is not especially effective when used alone.![]()

