Aquaforest said this on RC too:
Quote:
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Originally Posted by Aquaforest
Pro Bio F contains another Probiotic Bacteria than in Pro Bio S that's why You Can use Pro Bio S with Pro Bio F.
Regards,
Aquaforest
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So essentially you can use one or the other, or both. Maybe the ProBioF is a good option for sumpless tanks? I wonder if it is ok for skimmerless too?