Nitrates and phosphates - Red Sea NO3:PO4-X

[denny_CC]

after 5 weeks of %50 water changes and your nitrates are still sky high i would be looking at what the source is not an easy fix , a healthy system should drop nitrates after one or two water changes.

have you figured out where they are coming from??


where did you get your live rock and what kind is it

[Treebeard]

This tank is 90 gallons and has been up and running for almost 4 years, actually 5 when you consider the system was moved over from a smaller 40 gallon tank. I suspect that the live rock may be part of the problem but shouldn't the levels eventually drop after doing large water changes?
I really don't think I am over-feeding either.

[Proteus]

How many fish and what's your feeding shcudule
What do you have for clean up crew.

[Zoaelite]

Originally Posted by Treebeard

This tank is 90 gallons and has been up and running for almost 4 years, actually 5 when you consider the system was moved over from a smaller 40 gallon tank. I suspect that the live rock may be part of the problem but shouldn't the levels eventually drop after doing large water changes?
I really don't think I am over-feeding either.

Not if that problem liverock is leaching dissolved nutrients back into your tank.

[Treebeard]

So won't doing large water changes eventually deplete all of the stored nutrients from the live rock?

Originally Posted by Zoaelite

Not if that problem liverock is leaching dissolved nutrients back into your tank.

[Proteus]

Over time but if your over feeding than you still adding to the water colomn

[Treebeard]

Fish in this tank:

- Box fish
- Hippo tang
- Sailfin tang
- Kole tang
- Lawnmower blenny
- Royal Gramma
- Clown fish
- Matted file fish
- Leopard eel

The morning feeding is either a 2" square piece of nori or a New Era grazer.
The evening feeding is a couple of pinches of NLS pellets.
The eel gets a couple of 1/4" chunks of shrimp every 3 days.
I also feed the tank a small chunk of mysis once a week.

THE CUC was reduced to a couple of larger turbo snails until last week when I added a fresh crew consisting of about 22 hermits and 1/2 dozen snails.

[Proteus]

Are you on a canister filter or a sump

[denny_CC]

Originally Posted by Treebeard

So won't doing large water changes eventually deplete all of the stored nutrients from the live rock?

no because as the left over nutrients rot more they produce more nitrates, the quality of your liverock has alot to do with it too, if its base rock or not pourous its not going to be as effective as rock that is more pourous.


how long have you had nitrate issues


have you considered carbon dosing

[Treebeard]

It is good liver rock and some of it is very porous.
I am not sure when the nitrates actually got to this level because I stopped testing for a few months when the tank seemed happy, and it still is happy. Algae is not a huge problem, but I did add a couple of SPS which I never tried before. The tank was previously stocked with mainly LPS which were/are doing good. I added a monti and an acro which are showing good growth, but the colors are not.
Red Sea NO3:PO4-X.

Originally Posted by denny@conceptaquatics

no because as the left over nutrients rot more they produce more nitrates, the quality of your liverock has alot to do with it too, if its base rock or not pourous its not going to be as effective as rock that is more pourous.


how long have you had nitrate issues


have you considered carbon dosing