Now you lot can be as anally retentive as me!
Wouldn't worry about it. This is why a min 50% H2O change is done on a Saturday and Sunday is the 'relax & enjoy' day - tank resets itself, allows things to balance out. Plants won't mind as they don't react to changes quickly at all.My main concern is the potential PH shift. My tap water is around 6.8-7 where as the tank is 6.6.