Well, I bit the bullet and just reimplemented by bio-pellet reactor. I had disconnected it thinking that I didn't need it anymore. But looks like that is not the case. My nitrates gradually climbed, and up to 15 ppm now. So it was time to take action.
Previously, I did not have to add any bio pellets for about a year and a half, and it looked like my bio pellet consumption had slowed to almost nothing. But I guess the reactor was still doing its job and keeping the nitrates at zero even though there were only about 3 inches left tumbling. So I was quite surprised to see how quickly they rose again once the reactor was disconnected.
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