2 x MP40s will be more appropriate for your tank size. MP60 is a bit strong and I don't really recommend using it on anything < 30" depth, otherwise expect lots of sandstorm. MP60's undertow is extremely strong and I have to keep mine < 50% in my 72" x 24" x 30" 225g to prevent sandstorm.
Unless you have plans to get a larger tank in the future, I would stick with the MP40's.