Yes, the Po4 consumption or better absorption is quite high in a fresh or ULNS tank. Rock, bacteria and many other things use up the Po4. With nutrients now dropping so low, I would leave off any carbon dosing or at least heavily reduce carbon dosing and see where the tank will heading to.Hey Andre, here's an update.....
My ph problem was due to a bad probe, so once that was resolved, my current ph is running about 8.15 (I'd still like to get it a bit higher).
My issue now is that I can't keep my phosphates up. My nitrates have also consistently dropped and I am now down to 1ppm, with my phosphates at 0. I am dosing Phyto Feast nightly trying to bring it up, but the highest I've got my Hannah Phosphorus checker is 8ppb an hour after dosing.....the next day I get a reading of 0. I am up to 10ml of Phyto nightly, which seems like a lot....sometimes I even get a reading of 0ppb an hour after dosing (which amazes me, since I should always get a reading after dosing this stuff). I've turned my skimmer completely off 24/7, trying to keep the nutrients in the tank, so I am stumped on what else to do from here. My system is about 250 gallons total with 2 medium size fish and a small CUC. I also put a few tester frags in yesterday to see how they do. Let me know if u have any advice that may help. Thanks again!
You can see the jump start your tank did by this! I personally would use this point of time to increase livestock, but that is strongly depending on the empty wallet, lol.
Reduce the carbon dosing for now and watch out for the point where the Nutrients will not drop anymore that fast.