Ha! I took some water out and looked at it but the water wasn't brown, and it didn't look lumpy or anything. So I guess it was just the tubes. It kind of freaked me out because just a day or so ago the tubes were just chalky looking and now they're dark brown. Within a week the whole system changes anyway so I'll leave it as-is until then. No more water wetter for me.
Thanks for the advice!
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