Nitrate at 5ppm should I be concerned?

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I cannot seem to get my nitrate down below 4-5 ppm weather its  the test kit I am using Red Sea Pro or.. but its always seems to be at this level .. now over the last few weeks (don't know if it is because my tank is maturing down) but I have green algae on most of the rocks and the power heads .. I have got some silicate diatoms as well (hopefully they will clear up ) I have cut my lighting down to 10 hrs ramp  up and down with daylight of 4 hrs duration.

My concern or needing advice on this is .. are there to many nutrients in the water only have it lightly stocked as far as fish are concerned .. the green stuff has appeared over the last week or so but I don't want it to get to the pants stuff .. so want to be aware of any issues.. would a different test kit be of any use .. one that gives more measurable readings.

The corals in the tank at the moment seem happy enough.. just want to nip any potential problems in the bud

Mike

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Reply #1

5ppm isn't that high. I wouldn't worry.

Nitrates are being produced all the while you're diluting them out. If you can't get them below 5ppm, then you need to up the water change amount and or frequency.
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zollybosher

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Reply #2

Thanks I do a 15% water change every week ( its because I am sad and it doesn't take long) so maybe 25% or 30% every two weeks would be better... I mainly do the weekly water change to add a little Cal and Mag etc back into the tank due to the fact I have a couple of LPS..  and right now cant afford an automatic doser

Mike

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Reply #3

If you currently do 15% a week, then 25% a fortnight is a reduction in water changes. 30% a fortnight is just the same as what you do now.

20% a week would probably see them start to reduce, seeing as though you're maintaining nitrate level now.
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mav469

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Reply #4

Although the nutrients will only drop by 5% each time. If at 5 doing the extra 5% will reduce the nutrient level by 0.25ppm first week. Will then reduce it by 0.2375 the week after. It will take 4 weeks to get to about 4 ppm of everything stays the same (ie the amount of nutrients added etc) :)

zollybosher

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Reply #5

Thanks to both as always .. I will go with 20 and see how it pans out after a month .. if no better will increase...

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