Ouch! I never dropped KNO3 into the tank but I did drop a bottle of Flourish into the tank once, luckily for me it didn't do much harm. Just keep doing large water changes, as much as you can remove each time. I don't think you will need to redo the entire tank unless you decide it's a convenient time to do so for other reasons seeing you have no fish to worry about now. With enough water changes you will get things back to normal, definetly test the water to see what the levels are.
Sorry to hear about that, I guess as Rex said.... it's one of those lessons one often learns the hard way. I'm still waiting for the day that I learn not to do water tests on top of the tank's glass lids, one of these days....
Giancarlo
Sorry to hear about that, I guess as Rex said.... it's one of those lessons one often learns the hard way. I'm still waiting for the day that I learn not to do water tests on top of the tank's glass lids, one of these days....
Giancarlo
