The bigger the tank, the better and the more choice you will have. I would consider the space you have available and then buy the biggest tank you can fit into that space. I also wanted a community tank and a 2ft-wide available space, so I bought an 120L 2ft tank which was the biggest I could fit.
Neons and platies really need a 2ft tank. The horizontal swimming space is as important as the capacity, if not more so.
Neons and platies really need a 2ft tank. The horizontal swimming space is as important as the capacity, if not more so.