7 is a good pH actually, for most of the common fish it's at the low or high end of their range, but otherwise would still be in their range. XD
But yes, some actually requires stuff higher or lower than it.
And as above, it's actually just more important to keep it stable, whatever the pH is. Of course if it's at 4 or 10 or something that's really bad, but otherwise... yeah. Stable is more important than trying to bump it up and down slightly, which could backfire and kill off all your fish at once due to it being a sudden change.