Pets Asked on November 21, 2020
I set a 60 litre tank up and run it for 3 weeks, all water parameter levels fine. Added 4 fish, left 4 week’s all fine. Added 4 fish again and 5 days later fish started to die. Checked levels and the nitrite and nitrate were totally soaring. After first fish died on Saturday I did a gravel vacuum, large water change. Same again Sunday after another 2 fish died, also added Seachem Prime to try and save the fish.
Did another water change and vacuum today, still super high levels. I have 4 fish left and they are obviously struggling.
I don’t know what else I can do to help the poor things. I’m not very experienced with these problems, never had issues in the past.
Anything else I can do to help the poor fish? I feel so cruel ?
The first thing you need to do is to add some aquarium salt, this is done to counteract the effect of the nitrite on your fish' gills.
The aquarium salt concentration to use is 0,3%.
Do water changes 20% each day until the nitrite level drops, cut down on the feeding of your fish so you only feed twice a week and only a little food each time (this is to lower the bioload in your tank).
Do not clean the filter until you can see the flow is reduced, but keep on vacuuming the gravel each time you change some of the water.
Do not worry about the nitrate for now; you will have time to lower it when the nitrite spike is over in a couple of weeks.
More information about cycling a tank can be found here.
Answered by trond hansen on November 21, 2020
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