No,I did not add all fish in one go. I started with cheap fish at first and tested the water after that and it was OK. So I add more fish after that in a one week period. I think I am going to do a water change immediately and I will keep you up to date. Thanks for your advise mate,you are very helpfull.I also think I have too many fish for a 4 week old tank and I should have cycled for a longer period before adding any fish.
My setup is OK.I have a sump with UV
and bio balls and that works fine.