There are two more glider situations in the sixth generation. Both are based on the T5 triangle as a base piece, but since its use with the two gliders are diagonal reflections of one another, there probably isn't a nice coexistence situation in which one can overtake the other and produce nice simple collisiona. That's something that still has to be tried, however.
In the first combination, there is a shift of four cells after six generations. The two tiles needed for the two species are are:
Figure 20: One species moves 4 left every six generations against a background
generated by the other.
To tile the plane and thus construct an evolution, make diagonals from either tile:
Figure 21: The second species is the glider, moving against a background
established by the first.
Figure 22: The first species is the glider, moving against a background
established by the second.
Figure 23: One species moves 4 left every six generations against a background
generated by the other.