I use 2 - 20 gal tanks. Each has all their own heaters, filters, glass scrubbers, PVC etc. For filters I have HOB Aquaclear 100's I think. They have a little basket to hold up to 3 foam filters. I put 3 new filters in the basket and hang that right in my sump. When I need to set up a QT, I just take it out, pop it in the HOB filter and fire it all up.
All my fish go through a tank transfer regimen and I sterilize everything between transfers. During the tank transfer period I do not use the filters, as the fish go through a 100% water change every 3rd day and levels have never (IME) climbed high enough to be harmful.
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