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Little fish in a big pond
6,491 Posts
I'd keep an eye on nitrates and remove the bioballs incrementally IF nitrate becomes a problem. If you've been running it as a FO for that long without a nitrate issue, I think if it ain't broke, don't fix it.

I would like to clarify this:
I have a simple protein skimmer in the sump that spills excess into the bio balls in the wet dry.
I read it to mean that excess skimmate goes into the bioballs - but that must be wrong .... yes? If skimmate IS draining into bioballs I'd make that stop (and check nitrate with another test kit...).

Otherwise, I'd keep on doing what you're doing.

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