Sulfur denitrator experiment

[Delphinus]

Today = February 13
Started = January 2
-> So exactly six weeks

Today's readings:
Tank = 30ppm (up from 23 two days ago again, it crept down over the course of the week until now)
Effluent = 23ppm, 2 drops per second

At what point does one accept that something is just not going to work? I don't know where to go from here. It's bad enough to see a lack of tank nitrate reduction but to see such huge inexplicable jumps is insult to injury. I haven't fed my anemone in weeks, the only thing I can think of is that I fed my ONE fish some NLS pellets and an extra pinch for the shrimp, but to see a 10 ppm increase overnight in a 115g? That has a skimmer and a denitrator AND a remote-DSB AND a chaeto growout AND some mangroves? Doesn't make sense to me.