My tropical fish are dieing

[seano]

my tropical fish have strated to die and they are showing no signs of being ill they are all swimming fine i have done all the water tests they are spot on an i was told to treat them for paracities they strated to die on tuseday i just want to know why can you help please thank seano

 

[J_acon]

Give us your readings for Ammonia, Nitrites and so on.
Temperature and so on plsssss. Tank size too

 

[M/ASC]

anyone been polishing or using any aerosols around the tank at all?
are they still feeding?
temperature? its been pretty hot over here and i know people living in flats tend to suffer from heat problems.