I've been happy with my 15 gallon tanks for the transfer because:
a) they almost fit in my laundry room sink and are super easy to clean out
b) they don't take up a lot of space. I have both of them in the place I used to have my 40 gallon QT tank
c) 5 gallons doesn't give you much room for error in terms of feeding and ammonia control, 15 gallons is a little more forgiving.
and d) saves a bunch o' money on salt. You'd go through twice as much salt doing a transfer protocol using 30 gallon tanks.
I don't buy large fish as a general rule (I'd rather they get large in my tank!), but I did do the TT protocol on a medium sized copper band and two smaller fish at the same time and 15 gallons didn't seem to be a problem for them. Having a smaller footprint seemed to make it easier for the CBB to figure out how to eat prepared food, is it wasn't so dispersed.
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