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Is it a problem?

Subject: Is it a problem?
by Benjamin on 16/12/2020 21:43:13

Now that the tank has cycled, on Sunday we bought 7 White Cloud Mountain Minnows.
All seemed to be ok until this evening where we noticed that one fish stays away from the rest, tends to remain more or less at one area of the aquarium at a depth of about 10cm below surface. It did not eat and when moved around was a bit 'tail heavy'. All other fish are fine. We feed it some flakes and also every other day a small amount of daphnia.

I have checked the water and found:
Ammonia - 0
Nitrite - 0
Nitrate - 80
PH - 8
KH - 7
Temp - 24c

To be safe I have replaced 30% of the water. Do you have any ideas if it is something I am doing or could it just be a poorly fish that I have been unlucky to buy?

Thank you