Gotcha. That makes more sense. I was vodka dosing for 2 years on my tank. I was maintaining 4-6ppm nitrates and using lanthanum dosed into my skimmer neck (if, and only when needed) to maintain po4 at around 0.10 (0.08-0.16) and I had amazing growth and color. After installing the new sump within 3 weeks everything bottomed out. And I mean absolute zero. Started getting dinos and red slime. So I had to stop the vodka immediately and start dosing sodium nitrate and seachem flourish (per randy Holmes farley) and I hooked up the uv which almost immediately cleared up the dinos and red slime. But it was too much stress on the acros. But I'm hoping the nutrition a and b fixes it. I used a small travel refrigerator to keep the bottles cold and I'm gonna drill 2 holes though it for the dosing lines. This way it can stay cold and be dosed on a schedule.I am sorry I should have clarified. I do not use carbon. I use purigen for clarity thought about a uv but not sure if it would pull the phytoplankton I dose out of the water column. I carbon dose a reactor once a week with nopox or vodka usually rotate the two
Edit: I also wanted to quickly address that you said you were thinking about adding a uv... dont. If your carbon dosing to maintain nutrients, your building up bacteria levels in your water column as well as your system to lower nitrates. The uv will sterilize any bacteria that goes through it. so it's kinda counter productive. I didnt run a uv until recently after I stopped vodka dosing. Now with that said, I may be completely wrong but I swear I've read that alot over the years (ive been doing salt water since '99) and it makes sense in my mind. But that's just my opinion and my reasoning haha.