High Nitrates- Synptoms and How to Fix it

darthgoby

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Dec 28, 2006
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I have a 55 gallon saltwater tank. My tank has been going for about 3 months now. After my tank cycled with 4 chromis, I added a Blue Spotted puffer and yellow tang. I was testing my water every couple of weeks and my parameters were generally good (Ammonia- 0, Nitrite-0, Nitrate 10-20).

Wanting to spiff up my aquarium, I added some inverts including 5 feather dusters, a serpent star, some small nasarius snails, sea cumumber, and hermits to get with some turbo snails I had. I also added some shaving brush plants for decoration. I added a Royal Gramma about a week ago after he spent 2 weeks in quarantine.

Everything was fine in my tank until yesterday when I noticed that my Gramma didn't look good. He was having problems breathing and swimming around. I went ahead and did my monthly big water change (did 10 gallons or 20%). I used pre-made sea water from Petco for my water change. The gramma lasted a couple more hours after that and then passed onto fishy heaven.

I decided to go ahead and test my water finding out that my nitrates are through the roof (50+ PPM). It had never been that high before and wondered what could be causing it. My ammonia and nitrate were a little higher than 0 (next category up on the test kit but not off the scale like the nitrates).

Potential causes include:

1.) I admit that I'm probably overfeeding the fish since they weren't eating all the food that I was giving them. I have been giving them a cube of various frozen foods twice a day which they never ate all of it. Would overfeeding cause the nitrates to be really high?

2.) I've also been trying to feed microvert food to my feather dusters. I've been doing that every 2-3 days for a couple of weeks. Would that do it?

3.) I haven't seen my serpent starfish or cucumber in the past 2-3 days. Is it possible one or more of them died and is decomposing in the sand, rocks, etc?

4.) My shaving brush plants seem to be okay but is it possible they are responsible for the nitrates?

What really concerns me is that the nitrates were really both tonight and this morning after my water change. How soon after the water change will the change be noticeable?

Can anyone suggest any remedial actions beyond changing feeding habits and more water changes to deal with the problem?

Here is some information about my tank:

-55 gallon
-60 pounds live rock
-60 pounds live sand
-CPR backpack protein skimmer
-Filstar XP2 canister filter
-In-tank UV sterilizer
-2 small powerheads for circulation (various types)
 
Well, i would certainly check for dead to begin with....
How often do you clean the cannister filter?
How much water do you change?
As you say, cut back on your feeding. Over feeding will cause high nitrates, and potentially phosphates. Cut your feeding to every other day...Remember, in the wild, a fish may not get a meal every day, it may go for a while before it gets one...
Part of the reason maybe the speed you have stocked your tank...
I would stick to doing 20% water change every week and you should start to see the nitrates start to come down. Keep doing the maintenance on the filter as they have the potential to increase nitrates..Maybe even leave it off completely...

Niko
 
Well, i would certainly check for dead to begin with....
How often do you clean the cannister filter?
How much water do you change?
As you say, cut back on your feeding. Over feeding will cause high nitrates, and potentially phosphates. Cut your feeding to every other day...Remember, in the wild, a fish may not get a meal every day, it may go for a while before it gets one...
Part of the reason maybe the speed you have stocked your tank...
I would stick to doing 20% water change every week and you should start to see the nitrates start to come down. Keep doing the maintenance on the filter as they have the potential to increase nitrates..Maybe even leave it off completely...

Niko
in adidtion to all that what do you have in your canister as media? i know some stuff that will keep your tank wonderfully clean of all the nasty things.
 
You may also want to check the source water that you are using for your water changes(your pre-made seawater from Petco). Test it and make sure it is not adding additional nitrates. I know nothing about this water. You may just want to find an LFS near you that sells their RO/DI water and mix your own salt water that way you know what is in it for the most part. Most LFS in my area sell their RO/DI water for .25 per gallon. Pretty cheap.
 
You may also want to check the source water that you are using for your water changes(your pre-made seawater from Petco). Test it and make sure it is not adding additional nitrates. I know nothing about this water. You may just want to find an LFS near you that sells their RO/DI water and mix your own salt water that way you know what is in it for the most part. Most LFS in my area sell their RO/DI water for .25 per gallon. Pretty cheap.

good point there:)
 
Hi everyone,

Here are some actions I've taken so far and would like some additional suggestions.

1.) I've tested my pre-made water and the nitrate level was nil so I've eliminated that as a source of my nitrates. I will get some more from my LFS this weekend and do another 20% water change later this week.

2.) I've cut back on the feeding amount. I was feeding them whole frozen cubes since it was easier than cutting up my cubes. I spent yesterday cutting up all my cubes into half chunks and feeding them that after thawing them (another tip I got).

3.) I wanted some further advice on feeding. Would it be better to feed them once a day every day or would every other day be enough?

4.) I've cut back on feeding my feather dusters. I'll hold off on feeding them for a while and see how the nitrates do.

I also wanted to ask a couple of questions about cleaning my filters. I clean my canister filter every 3-4 weeks. I rinse out the pads, empty the water, remove any waste and refill it with clean water. Should I clean it more often?

Also, I have never completely cleaned my protein skimmer. I clean out the cup regularly but noticed that there is some "stuff" in the bottom of the skimmer? Should I remove that or does it matter?

By the way, I don't have any media in my protein skimmer or cannister filter since I heard they can be nitrate producers.

Thanks for all of the help so far.
 
Ok, good to see you taking some measures to combat this problem...

1) no problem, test the water from LFS aswell when you get it..
2) That should reduce phosphates and stop fish eating something that is potentially still frozen..
3) I would suggest feed every other day
4) ok

Cleaning your filters....Clean them every week, strictly...Wash them out in tank water, not fresh else you will destroy the good bacteria that is building a colony on there..No need to empty the water or anything, cleaning the pads and maybe removing any debry at the bottom is good enough...

Skimmer - I clean my cup everytime i empty it..Every month i strip the skimmer down and give it a full clean, including the powerhead/pump if yours uses one...

Ok, now just seen that you dont have any media in filter and obviously just use it for extra circulation.....so, ignore what i said earlier....just remove any debri that collects at the bottom...

Hope that helps a little...Keep us posted

Niko
 
Hi there,

Thanks for all of your help so far.

I wanted to let you know what I've been doing.

1.) I've cut back on the feeding and made sure there wasn't any extra or decaying food on the bottom.

2.) I checked the sand for dead things and didn't find anything buried. My cucumber made an appearance so he isn't dead like I thought.

3.) I also got a new Nitrate test. I bought a stand alone test (with drops, not a strip) made by API and the Nitrate readings are substantially different from my Red Sea test. My API test says that my Nitrates are 20-40 PPM while my Red Sea test says it is 50 PPM. Has anyone else had a difference in results? Can anyone recommend if either test is better.

I'll do another test after my weekend water changes. Fish and inverts seem happy for now. Thanks again for all of your help.
 
I had the same issue with the strip tests showing more than the drop test. They always seemed to show higher. It wasn't just the nitrate, but also nitrite and ammonia showed sometimes on the strip but the drop said none.
 
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