I would try to keep them from actually contacting each other to avoid potential allelopathy.
I did once have a crispa that seemed to keep moving towards an LTA and while they are supposed to not have a brain, and do not hunt or anything, it certainly looked like it kept going after it, but who knows, maybe they both just liked the same flow and light in that area.
I separated them a few times manually and eventually they both ended up becoming book ends at each end of a 180g and stayed put for 5.5 years, and never moved again during that period.