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Every 3 to 4 weeks. Could you be measuring lanthanum phosphate with your po4 tester?. If you dose every day, some might remain in the water until skimmed out. Maybe 10 microns is not small enough. Do you see creamy skimmate, which I see when I run lc.I do but no cheato in there right now, some ulva and some type of rooting macro but doesn’t look like caulerpa. Since I have been dosing silica so heavily growth has really stopped in there. I’m guessing the diatoms are sucking trace nutrients after thinking about it for a while. I should be able to back down the silica dosing after one more week. My sand is looking real nice. I do have quite a bit of cyano in the fuge and some spots on the rocks with my phosphate being so high but I am leaving that there for now. Got the knife to the throat of my dinos and not backing down from that yet. After 14 months I am going to beat them this time.
For now I think I will keep up with the phosphat-e dosing. The source has got to slow down eventually. I’ll tell you what, I really regret not shutting the tank back down and selling off the corals I had to beat dinos from the start before I stocked up the whole dang thing.
@Pistondog i am curious how often you do dose phosphat-e to lower back down from .5ppm. My feeding is so minimal I can’t see that being the source of all this phosphate. I am dosing between 4-6ml of phosphat-e per day but it’s not making a dent.
How can we verify you are removing it from your tank?