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over done the water change

Subject: over done the water change
by Harry on 30/11/2014 19:12:04

Can anyone help I have done a 40% water change yesterday, looked ok tonight all fish at the surface looks like they are gulping for air. I used a chlorine remover when mixing the salt and water.
NO3:- 20
No2:- 0.5
PH:- 7.5
Ammonia:- 0.2ppm

any advice? I have no medicines and cannot get them until tomorrow evening.