Can’t lower phosphates

reefyjoe

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Hi ,
My tank is around 16 month old . I, for the life of me, cannot seem to reduce my phosphate I test bi-monthly with Hanna testers and the result is always 0.9 which I believe is the tester maxing out.

All fish are okay however my corals seem to be struggling. I’ve had a full zoa garden seem to dissolve and also all pulsing xiena.

Over the past couple month I have fully cleaned out the sump . Vacuumed the sand and have had a Gfo reactor running which seems to be having no effect .
I have had another recent icp test done to confirm my Hanna result which was 0.805 mg/l for phosphate so I know the tester is reliable .

The tank is a Red Sea reefer 250.
Fish : 2 clown fish, 2x wrasse , 1 x fox face , 1 x filefish.
I dose all for reef daily and do 2 x 50 litre water changes a month.

Is there anything else I can try?
 

HOW MUCH DOES A FISH’S FEEDING REQUIREMENTS AFFECT YOUR STOCKING DECISIONS?

  • A lot! - I avoid fish that require frequent or specialized feeding

    Votes: 12 29.3%
  • Quite a bit, but an automatic feeder can change my answer

    Votes: 6 14.6%
  • It depends on whether my nutrient export can handle it

    Votes: 6 14.6%
  • It depends on how badly I want the fish

    Votes: 10 24.4%
  • Not much. I’m willing to adjust my routine

    Votes: 9 22.0%
  • Not at all. Feeding demands don’t limit my stocking choices

    Votes: 7 17.1%
  • I usually learn about the demanding feeding schedule after buying the fish!

    Votes: 2 4.9%
  • I haven’t really considered this before

    Votes: 3 7.3%
  • Something else (see my comments in the thread)

    Votes: 1 2.4%
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