Thanks - that's useful advice. Unfortunately I don't have a sump and my tank is 55g so it cannot easily take a 10g loss without having change water prepped in advance. I'm slowly convincing myself however that I should age my change water a little more than I currently do however (eg. I changed 10% this weekend with water I had kept mixing for about 36 hours).
One question - assuming I have not had the QT
filter running in my main tank for a week in advance (since I do not have a sump and don't want to keep it in the main tank all the time) will filling the QT
with water from the main tank and dropping in a fresh filter be enough to seed the bio-filtration in the filter media ?