Help! Nitrate spike in established tank - Tropical Fish Keeping - Aquarium fish care and resources
LinkBack Thread Tools
post #1 of 4 Old 02-14-2014, 05:14 PM Thread Starter
New Member
Help! Nitrate spike in established tank

Hi all

I'm hoping you can provide me with some help and guidance. We have an 89 litre bout tank. It's about three years old and has been cycled for about the same time.

The nitrate levels have been stable at 20 for months. We've now had a sudden spike.

I did a water change on Saturday (usually do a third water change every 2-3weeks) and tested the water rates a few hours after the change. Nitrates were down low.

Then last night I noticed the fish were clamping fins. Took a water test last night and nitrate was at 80!

Why? No new fish added recently.

I guess daily water changes will bring it down?

Please help
Chloeer is offline  
Sponsored Links
post #2 of 4 Old 02-15-2014, 06:25 PM
NeonFlux's Avatar
Hmm.. sorry to hear your troubles.

Could be a number of reasons why your nitrate is so high now.. The fish in the tank may finally becoming more bigger, thus adding to more bioload and nitrate, also, maybe you feed a lot excessively.. :) You'd best do a very large water change right now to get it to about 5 - 10ppm while carefully making sure the temps remain stable and not get too high or low. So water change, feed less, and maybe remove some stock. Water changes should help with clamped fins, adding melafix would help a bit too.
NeonFlux is offline  
post #3 of 4 Old 02-15-2014, 09:34 PM
Reference Team
sandybottom's Avatar
would not add meds for high nitrates.more water changes.make sure your filter is strong enough for the stock load.has the filter been maintained correctly?do you have gravel,if so have you been doing thorough gravel vacs?

bettas-goldfish-shrimp-snails-planted tanks
sandybottom is offline  
post #4 of 4 Old 02-16-2014, 05:20 PM
TFK Moderator
SeaHorse's Avatar
Sorry you are having troubles. Did you test your tap water to see if you have Nitrates there? Just a thought.... you can't lower it if they are found in the source water. Probably not likely but you should check.

AND I think the NitrATe test is 2 bottles.... shaken 5 min? and WE MEAN SHAKE for 5 min. I think you need to shake the sediment in the bottle before testing too. This is the one test that can read wrong very easily if the instructions aren't followed. Just hints to help solve the issue.

Good Luck. and Welcome !!

Every kid, regardless of what they are going through, is ONE caring adult away from being a success story. ~ Josh Shipp, Teen Behavior Expert
SeaHorse is offline  

nitrate , spike

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Nitrate spike JonandJo Beginner Freshwater Aquarium 17 12-09-2013 03:15 PM
Sudden ammonia spike in established tank? LyzzaRyzz Beginner Freshwater Aquarium 11 09-02-2012 04:23 PM
Nitrite Spike in established tank. How/Why? Pufferfish22 Beginner Freshwater Aquarium 6 02-19-2011 02:14 PM
Nitrite, nitrate spike in established tank Julie's Julies Tropical Fish Diseases 6 07-29-2007 11:37 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome