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Old 11-22-2017, 03:20 PM   #1
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Decreasing phosphates

I need some advice on dropping phosphates. I seem to be stuck at minimum 0.13 and can't seem to get it any lower, I use a new Hannah checker. My nitrates have measured at 0ppm for the last 2 weeks using a red sea nitrate kit.

My tank: 40g breeder with 2 clowns, 1 small fairy wrasse, and 1 smallish engineer goby at about 6" long. I feed a small amount of frozen food daily. 1 cube of mysis will last 4 - 5 days.

I run Gfo, activated carbon, a 110g reef octopus protein skimmer, and a refugium growing chaeto and grape caulerpa. I have an auto top off with 1tbsp of kalk per 5 gallons. My filters on my rodi unit are approx 1 month old.

Until the last week I was getting quite a bit of cyano growth. I have gotten that under control and now it's switched to hair and bubble algae.


Dies anyone have any suggestions to decrease phosphates just a little bit more?
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Old 11-22-2017, 06:40 PM   #2
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How long have you been running gfo and have you been increasing the amount gfo, keeping it at a low tumble of course.
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Old 11-23-2017, 09:47 PM   #3
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how often do you trim your macro , the reason I ask macro die off could be just putting the phosphates back into the water . I trim back between a quarter inch to a half inch every week this helps them rejuvenate .

as the macros decompose over time there just putting the phosphates back into the water , this is why trimming is important the grape really don't work as well as some thin leafy macros exorbing nutrients . like Caulerpa Mexicana and similar types of macros , these type macros grow fast and needs constant trimming rejuvenating promoting new growth .

I just did my yearly cleaning on my sump god if you only saw all the decomposed macros that built up over time yes I found my phosphate problems . after cleaning my sump I made a vow every 3 months the sump gets a cleaning . now I also made 2 inch high shelves out of egg crate to raise the pumps and skimmer . so it's easier to siphon out the crude underneath everything in the sump before it builds.

this page should help give you a little help and understanding of most macro's marineplantbook
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Old 11-24-2017, 05:33 AM   #4
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Are you rinsing your foods? Many foods introduce PO4 to tanks?
Some go farther then GFO and use Lanthanum Chloride [sea clear PO4 remover for spas !]
https://www.google.com/url?sa=t&rct=...sVmayLXSM8W6Ua
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Old 12-06-2017, 12:52 AM   #5
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What is your water source? Are you running ro/di unit or tap? It sounds like this may be your problem especially that you have a refugium and running gfo.
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Old 12-17-2017, 10:50 AM   #6
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Sorry, been super busy and haven't hopped on in a while. I did the harvesting on the macros as suggested along with a big tank cleaning. I didn't see any changes in the phosphate over a weeks course. However I checked the phosphate levels this morning and they were at 0.00ppm. Checked them 3 times just to be sure so I am gonna decrease the amount of go I'm using.

If I were to guess, my rocks were leeching some phosphate along with the poor refugium maintenance. Thanks for the help guys
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Old 12-17-2017, 10:51 AM   #7
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Quote:
Originally Posted by speedy51 View Post
What is your water source? Are you running ro/di unit or tap? It sounds like this may be your problem especially that you have a refugium and running gfo.
I'm using ro/di
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Old 12-17-2017, 08:44 PM   #8
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I have never been a believer in the rock leaching phosphates. If it was coming from the rock, it would have been some sort of decomp occurring inside the rock itself.
As for that phosphate reading, is still be skeptical. That is hard to do for even uln systems to obtain, to which 0.03 being as low as they want to go without consequences from a coral standpoint.
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Old 12-17-2017, 11:32 PM   #9
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Calcium carbonate is used in the medical field as a phosphate binder for renal patients so it wouldn't surprise me at all if live rock absorbed it to some degree.

I'm also using 10tbsp of gfo in a 40g tank atm which was recently changed out.

I would hate to not be able to trust my hannah checker, but I will see if I can get it verified. The reagents are brand new and after adding them to the vial there wasn't any color change which in the past it turned noticeably blue.
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Old 12-18-2017, 12:37 AM   #10
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When was the last time it was calibrated?
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