What can i do/clean to lower very high nitrates?

[Reef_at_Sea]

Hello,

I am still struggling with insane high nitrates & i still don’t know the reason why.

I don’t feed alot. I have 8 small-medium sized fish in a 50g tank (2x clown, 1x links goby, 1x midas blenny, 1x lawnmower blenny, 1x pink streaked wrasse, 1x fridmani basslet, 1x dwarf flame angel) & a clean up crew of about 8 snails & 3 hermit crabs.

My skimmer takes about 2 days to fill a cup & i am dosing nopox & tried vodka/vinegar for a while now but nothing helps except huge water changes. But nitrates creep up after that again.

Are there any steps that i can test or i should do before i make the decision to remove fish?
Should i vacuum my sand thoroughly or something? I removed my filter socks because i hated them & changed to floss in filter cups. I change the floss every day.

Note that my tank had high nitrates even before i added fish so i’m starting to think something is wrong with my bacteria household.

I have about 20kg of rock & 2liters of biospheres in my AIO sump.

Please help me because idk what to do anymore..

I’m talking about 75ppm or higher
phosphate usually drops down to 0,02 in about 1-2 days so i dose phosphate to help remove nitrate.

I will answer every question honestly so you can help me the best

 

[sixty_reefer]

I believe you may have answered your question, there is a possibility that your phosphate is lower than you think it is.
Personally I would keep it above 0.05 to eradicate test error

 

[ReeferDog]

If you want to vacuum your sand bed, I would not do it all in one shot. Do it in smaller sections like 20% or 25% of the sand bed across multiple water changes. Disturbing the entire sand bed at once could cause a nutrient spike.
Inspect the bottom of your AIO sump for detritus build up and vac that out if there is any. As long as you rinse your AIO bio media in tank water (can be 'outgoing' water from a recent water change), you can flush any detritus from the rock and bio-spheres in there.
For good measure, I'd also take a powerhead or turkey baster and blow off your entire rock structure right before your next water change to get any detritus suspended in the water column for you to remove or your filter to pull it out.
You could also dial back your skimmer to get more of a dry skim compared to a wet skim, if you're not doing that already.
Since you are in the EU.... have you ever had your source water tested for Nitrates? If you're getting it from a LFS, then you're probably fine.

Good Luck.

 

[Reef_at_Sea]

I believe you may have answered your question, there is a possibility that your phosphate is lower than you think it is.
Personally I would keep it above 0.05 to eradicate test error

I kept my phosphates at 0,10 for 2 months while carbon dosing & i didn’t see any results

 

[Reef_at_Sea]

If you want to vacuum your sand bed, I would not do it all in one shot. Do it in smaller sections like 20% or 25% of the sand bed across multiple water changes. Disturbing the entire sand bed at once could cause a nutrient spike.
Inspect the bottom of your AIO sump for detritus build up and vac that out if there is any. As long as you rinse your AIO bio media in tank water (can be 'outgoing' water from a recent water change), you can flush any detritus from the rock and bio-spheres in there.
For good measure, I'd also take a powerhead or turkey baster and blow off your entire rock structure right before your next water change to get any detritus suspended in the water column for you to remove or your filter to pull it out.
You could also dial back your skimmer to get more of a dry skim compared to a wet skim, if you're not doing that already.
Since you are in the EU.... have you ever had your source water tested for Nitrates? If you're getting it from a LFS, then you're probably fine.

Good Luck.

Hmm, i've always read mixed comments about vacuuming a sand bed & i'm kinda scared of it because it might cause a nitrate spike.

I thought that you should always run wet skim instead of dry skim when dosing nopox or carbon source?
I did test my newly made salt water & it has undetectable nitrates.

 

[TangerineSpeedo]

Put some easy SPS in your tank... that will suck all the nutrients out...
How often do you do water changes and at what percentage?
Also a filter roller will help. I do not know which AIO tank you have but there may be a commercial or private filter roller for your tank. The AIO tank I have always seems to have high nutrients. most ppl. have a hard time with Po4 export but with nitrates water changes will take care of them. You can do a 5g water change every day until they come down. And a side note double check with another test kit just to be sure.

 

[Reef_at_Sea]

Put some easy SPS in your tank... that will suck all the nutrients out...
How often do you do water changes and at what percentage?
Also a filter roller will help. I do not know which AIO tank you have but there may be a commercial or private filter roller for your tank. The AIO tank I have always seems to have high nutrients. most ppl. have a hard time with Po4 export but with nitrates water changes will take care of them. You can do a 5g water change every day until they come down. And a side note double check with another test kit just to be sure.

Easy sps? won't those just die in nitrates 75ppm?
i do a 25% water change every 2 weeks.
I use filter floss in a media cup that i change every day, filter rollers are not available sadly...
I don't have any problems with po4 export, only problems with high nitrates.
i did double check with an ICP.

i am doing large water changes atm to get it down asap, i'm also thinking about using bio-pellets/blocks.

 

[TangerineSpeedo]

Easy sps? won't those just die in nitrates 75ppm?
i do a 25% water change every 2 weeks.
I use filter floss in a media cup that i change every day, filter rollers are not available sadly...
I don't have any problems with po4 export, only problems with high nitrates.
i did double check with an ICP.

i am doing large water changes atm to get it down asap, i'm also thinking about using bio-pellets/blocks.

Bio pellets will pull both No3 and Po4 and you have low Po4 so that may create more havoc in your tank.
I would try a 10g water change every other day until your No3 is manageable. then put in some easy sps (porcillipora, green birdsnest, etc.) Anything that your fellow reefers locally can not get rid of fast enough.
It is hard to tell, but from your FTS it doesn’t seem like you have any algae issues.

 

[Reef_at_Sea]

Bio pellets will pull both No3 and Po4 and you have low Po4 so that may create more havoc in your tank.
I would try a 10g water change every other day until your No3 is manageable. then put in some easy sps (porcillipora, green birdsnest, etc.) Anything that your fellow reefers locally can not get rid of fast enough.
It is hard to tell, but from your FTS it doesn’t seem like you have any algae issues.

I don’t have algea issues at all ha.

 

[RoyvG]

So what is the problem besides a high reading for nitrate? If you don't see negative effects I wouldn't worry too much.

 

[Reef_at_Sea]

So what is the problem besides a high reading for nitrate? If you don't see negative effects I wouldn't worry too much.

Corals aren't happy anymore + the nitrate is raising out of control, it's a constant battle of trying to keep it controlled, else it would rise to 200...

 

[Dan_P]

Hello,

I am still struggling with insane high nitrates & i still don’t know the reason why.

I don’t feed alot. I have 8 small-medium sized fish in a 50g tank (2x clown, 1x links goby, 1x midas blenny, 1x lawnmower blenny, 1x pink streaked wrasse, 1x fridmani basslet, 1x dwarf flame angel) & a clean up crew of about 8 snails & 3 hermit crabs.

My skimmer takes about 2 days to fill a cup & i am dosing nopox & tried vodka/vinegar for a while now but nothing helps except huge water changes. But nitrates creep up after that again.

Are there any steps that i can test or i should do before i make the decision to remove fish?
Should i vacuum my sand thoroughly or something? I removed my filter socks because i hated them & changed to floss in filter cups. I change the floss every day.

Note that my tank had high nitrates even before i added fish so i’m starting to think something is wrong with my bacteria household.

I have about 20kg of rock & 2liters of biospheres in my AIO sump.

Please help me because idk what to do anymore..

I’m talking about 75ppm or higher
phosphate usually drops down to 0,02 in about 1-2 days so i dose phosphate to help remove nitrate.

I will answer every question honestly so you can help me the best

How old is the aquarium?

Have you confirmed that nitrite is not present?

What was the highest dose of vinegar or ethanol before you switched to NOPOX?

 

[Reef_at_Sea]

How old is the aquarium?

Have you confirmed that nitrite is not present?

What was the highest dose of vinegar or ethanol before you switched to NOPOX?

Tank is 6-7 months old, no nitrite present.
Highest dose was 40ml vinegar.

 

[Dan_P]

Tank is 6-7 months old, no nitrite present.
Highest dose was 40ml vinegar.

If you started with high nitrate, you might need to do a large water change to bring it down to where you want it to be. Reducing nitrate with macro algae or vinegar dosing can take a month or two starting at 70 ppm. Controlling an increase in nitrate is much easier than trying to get rid of a large amount plus the new nitrate being generated every day.

 

[Reef_at_Sea]

If you started with high nitrate, you might need to do a large water change to bring it down to where you want it to be. Reducing nitrate with macro algae or vinegar dosing can take a month or two starting at 70 ppm. Controlling an increase in nitrate is much easier than trying to get rid of a large amount plus the new nitrate being generated every day.

Yeah, i just started doing 30% water changes every 2 days or so, but now my RODI seems to have decreased in quality, so i'm stuck...

This afternoon i'm going to the LFS to get a TDS meter & some RODI water + they also seem to have bio blocks that can break down nitrates without phosphates, somoene i know uses them & tells me they work but they also take time to work.

 

[Dan_P]

Yeah, i just started doing 30% water changes every 2 days or so, but now my RODI seems to have decreased in quality, so i'm stuck...

This afternoon i'm going to the LFS to get a TDS meter & some RODI water + they also seem to have bio blocks that can break down nitrates without phosphates, somoene i know uses them & tells me they work but they also take time to work.

Denitrification can take weeks to start working.

Good luck!