In my opinion the TOP FIN, over the other one. Hexagonal tanks do not leave a large amount of swimming area for the fish, so rectangular is better.
The QT tank, nothing wrong with that
The QT tank, nothing wrong with that
I want a smaller one for QT, simply 'cause I'm not the most careful person in the world and emptying 2.5 gal of whater every day is sure to equal disaster. XDI use a regular old 2.5 gal tank for QT, it's actually this one.
I would get the 10gal kit, but there is a tetra kit that's $10 cheaper just without the heater. I also bought my kit for $40 at petco with all that stuff in it.