Can red eared slider live together?

well i have 4 that i got all together, i was only gonna get 2 then i realised cant have michaelangelo etc from ninja turtles with only 2 so got 4.

As long as enough space as in 2007 they were babies and were so small now they are big started off in a tank then one would attack the smaller one. So read on internet needed space so now in a pond outside