i've just got home from holiday about 2 hours ago to find that the filter on my fish tank isn't working right, and that the angle fish is swimming with its nose in the air sometimes swimming upside down. not good, i have sorted the filter and have done a 50% water change before changing the water i did a water check here are the readings.
ammonia :-2.0
nitrate :- 20 ppm
nitrite :- 0.25 ppm
ph 7.6
is there anything else that i can do like i said i have already sorted the filter its an external 204 fluval.
she seems to be the only fish effected.

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If you can't get some mature media to reseed your filter I would put a polyfilter in
Polyfilter

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thank you for that information

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A true friend is like a good bra hard to find, lifts you up, gives you surport and is always close to your heart.