I would try to raise your nitrates to at least 10ppm mark and you will start seeing phosphate going down assuming you are not feeding a lot of phosphate rich fish foods.Should I use GFO?
My tank is coming out of the second dino outbreak (prorocentrum). Both times it was caused by using fluconazole followed by chemiclean (I was a little impulsive with their use).
The tank is now 6 months old. It is a 25 gallon nano. I see dinos (air bubbles towards the end of the photo period) on only 1 rock. I do not see any mucus layers or strands. The sand bed has a light dusting of diatoms. It has been staying that way for a week. I do not have explosive hair algae yet; my urchin and hermits clean them up quickly.
My problem - Phosphates have been staying above 0.00 since the end of December. I didn’t dose that much phosphates but had some sail die off. It is currently sitting at 0.254. Measured with Hanna phosphorus ULR. Is it too early to use GFO? I want to bring it just under 0.100.
Additional points:
- Phospahtes whet up when I ramped up SpongExcel dosing. Have not dosed any since 2 weeks.
- My nitrates bottom out if I do not dose. That has been a problem during the entire 6 months.
- I dose AFR. Tank is mostly SPS.
GFO will reduce phosphates but you have to be careful not to bottom it out. I would use a little first and see the effect and go from there. Make sure to test daily to monitor it.
I used phosphate E from brightwell to lower my phosphate before as that is a very controlled method . Just follow the instructions on the bottle to achieve your desired target