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I would be trying to find where
the no3 and po4 coming from. Did you reuse the sand when you took over this tank?
If you have the room, consider a refugium with chaetomorpha as a means of nutrient export.
You tank, thought it's contents are not young, is still young and quite possible that the previous owner had elevated nutrients. The rock is most likely the source. It may take some time for it to leach out. Especially the P04.
Yeah, I kept the sand and rocks. When I brought the tank to my home. The next few days I had it back running.
There’s a sump with a refugium that came with the setup. I have tried the chaeto but it did not grow at all. The DT was out competing it. I was thinking once I get the DT under control, then I would add some form of macro algae.