hi thanks for all your help.
i did flush the blue chees(the smaller one)tonight so hopefully it will be ok thats the one im most worried about as the lower leafs are dying quickly.so do you think it is a salt build up? the other plant(super haze)seems to be ok its just some of the fan leafs going yellow.would that be nitrogen deficenity?i flushed that one last week but have been feeding it 1m grow 1m bloom per litre keeping the ph at 7 .is that ok?