What are the maximum nitrite levels can guppies and platies fish still

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hoaa

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survive for how long? I am new to aquariums. I have my new 54 liters aquarium for 17 days now, I used silent cycling using plants (I have 7 plants now with plants substrate under the gravel)), I also introduced bacteria. At the day 7 nitrite reading was 0.1 and at day 11 it was around 0.03 according to my shop, and there is a Nitrate reading of ~25 and ammonia is 0, so I was happy that it works, so I decided to introduce fish and I took 3 guppies and 3 platies. After the second day one platy female died, but i found later that there are 4 baby fish :), so i though she died of birth (is that true or because of ammonia?(Ph level is ~8, I don't have a test kit for ammonia), after another 2 days a male platy died :(, the nitrite reading was a bit below 0.5 (the lowest reading on my test kit after 0), could it be that this killed it? On that day directly I did about 40% water change. Yesterday I moved all the fishes to a clean water outside the aquarium because I was afraid that all will die (the nitrite level is between 0.5 and 1), I kept the babies since they are hard to find and catch, but it looks they are doing fine. So what do you advice me to do next? It looks that there is not enough bacteria, I am thinking to bring the fish back to the aquarium and do 20% water changes everyday and hoping that the fish will survive until the bacteria do better work.
 
54 liters and 6 fish all at one time in a new tank. That was the start of the problem. New tanks should only have one or two fish added at a time not 6. Nitrates are fine You really need to get an ammonia test kit here. PH for these fish is also fine at 8. Usually nitrites at .5 in more cases than not won't kill your fish.

You are now housing your fish outside the tank which is almost fully cycled and have them once again in an uncycled container. Doing this moving places a lot of undue stress on your fish. They should remain in the main tank here. Water change is your friend here.

When you first got your fish did you acclamate them properly? how about when you removed them from the tank?

You need to return your fish to the main tank. Test your water and do 25% water changes when needed to keep the nitrites under control.

What ever you do do not keep adding chemicals for cycling.
 
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