In general the recommendation is that skimming is first to remove as much as possible before biological filtration. I am not sure it would make a huge difference but that is the general rule of thumb.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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