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I scanned through your comments before posting and didn't think I saw where you had (thinned). I have never tried to run 100% but have had good luck up to 70 or 75%. I usually hover around 50/50 and always premix before filtering and gravity filter also. Has worked very nicely in my old 7.3 PSD for several years. (I'm filtering another tank for a week-end trip as I'm posting this).
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